Latest Log: https://paste.ee/p/HT6EH

Met the same problem when testing. Here's the game log:
MultiMC version: 0.6.12-develop-1459

Minecraft folder is:
D:/Program Files/MultiMC/instances/单独排查/.minecraft

Java path is:
D:/Program Files/Java/jdk-14.0.1/bin/javaw.exe

Java版本14.0.1, 在64-bit架构上

Main Class:
net.fabricmc.loader.launch.knot.KnotClient

Native path:
D:/Program Files/MultiMC/instances/单独排查/natives

Traits:
traits FirstThreadOnMacOS

Libraries:
D:/Program Files/MultiMC/libraries/org/lwjgl/lwjgl-glfw/3.2.2/lwjgl-glfw-3.2.2.jar
D:/Program Files/MultiMC/libraries/org/lwjgl/lwjgl-jemalloc/3.2.2/lwjgl-jemalloc-3.2.2.jar
D:/Program Files/MultiMC/libraries/org/lwjgl/lwjgl-openal/3.2.2/lwjgl-openal-3.2.2.jar
D:/Program Files/MultiMC/libraries/org/lwjgl/lwjgl-opengl/3.2.2/lwjgl-opengl-3.2.2.jar
D:/Program Files/MultiMC/libraries/org/lwjgl/lwjgl-stb/3.2.2/lwjgl-stb-3.2.2.jar
D:/Program Files/MultiMC/libraries/org/lwjgl/lwjgl-tinyfd/3.2.2/lwjgl-tinyfd-3.2.2.jar
D:/Program Files/MultiMC/libraries/org/lwjgl/lwjgl/3.2.2/lwjgl-3.2.2.jar
D:/Program Files/MultiMC/libraries/com/mojang/patchy/1.1/patchy-1.1.jar
D:/Program Files/MultiMC/libraries/oshi-project/oshi-core/1.1/oshi-core-1.1.jar
D:/Program Files/MultiMC/libraries/net/java/dev/jna/jna/4.4.0/jna-4.4.0.jar
D:/Program Files/MultiMC/libraries/net/java/dev/jna/platform/3.4.0/platform-3.4.0.jar
D:/Program Files/MultiMC/libraries/com/ibm/icu/icu4j/66.1/icu4j-66.1.jar
D:/Program Files/MultiMC/libraries/com/mojang/javabridge/1.0.22/javabridge-1.0.22.jar
D:/Program Files/MultiMC/libraries/net/sf/jopt-simple/jopt-simple/5.0.3/jopt-simple-5.0.3.jar
D:/Program Files/MultiMC/libraries/io/netty/netty-all/4.1.25.Final/netty-all-4.1.25.Final.jar
D:/Program Files/MultiMC/libraries/com/google/guava/guava/21.0/guava-21.0.jar
D:/Program Files/MultiMC/libraries/org/apache/commons/commons-lang3/3.5/commons-lang3-3.5.jar
D:/Program Files/MultiMC/libraries/commons-io/commons-io/2.5/commons-io-2.5.jar
D:/Program Files/MultiMC/libraries/commons-codec/commons-codec/1.10/commons-codec-1.10.jar
D:/Program Files/MultiMC/libraries/com/mojang/brigadier/1.0.17/brigadier-1.0.17.jar
D:/Program Files/MultiMC/libraries/com/mojang/datafixerupper/3.0.25/datafixerupper-3.0.25.jar
D:/Program Files/MultiMC/libraries/com/google/code/gson/gson/2.8.0/gson-2.8.0.jar
D:/Program Files/MultiMC/libraries/com/mojang/authlib/1.6.25/authlib-1.6.25.jar
D:/Program Files/MultiMC/libraries/org/apache/commons/commons-compress/1.8.1/commons-compress-1.8.1.jar
D:/Program Files/MultiMC/libraries/org/apache/httpcomponents/httpclient/4.3.3/httpclient-4.3.3.jar
D:/Program Files/MultiMC/libraries/commons-logging/commons-logging/1.1.3/commons-logging-1.1.3.jar
D:/Program Files/MultiMC/libraries/org/apache/httpcomponents/httpcore/4.3.2/httpcore-4.3.2.jar
D:/Program Files/MultiMC/libraries/it/unimi/dsi/fastutil/8.2.1/fastutil-8.2.1.jar
D:/Program Files/MultiMC/libraries/org/apache/logging/log4j/log4j-api/2.8.1/log4j-api-2.8.1.jar
D:/Program Files/MultiMC/libraries/org/apache/logging/log4j/log4j-core/2.8.1/log4j-core-2.8.1.jar
D:/Program Files/MultiMC/libraries/com/mojang/text2speech/1.11.3/text2speech-1.11.3.jar
D:/Program Files/MultiMC/libraries/net/fabricmc/intermediary/1.16.1/intermediary-1.16.1.jar
D:/Program Files/MultiMC/libraries/net/fabricmc/tiny-mappings-parser/0.2.2.14/tiny-mappings-parser-0.2.2.14.jar
D:/Program Files/MultiMC/libraries/net/fabricmc/sponge-mixin/0.8.1+build.21/sponge-mixin-0.8.1+build.21.jar
D:/Program Files/MultiMC/libraries/net/fabricmc/tiny-remapper/0.2.2.64/tiny-remapper-0.2.2.64.jar
D:/Program Files/MultiMC/libraries/net/fabricmc/fabric-loader-sat4j/2.3.5.4/fabric-loader-sat4j-2.3.5.4.jar
D:/Program Files/MultiMC/libraries/com/google/jimfs/jimfs/1.2-fabric/jimfs-1.2-fabric.jar
D:/Program Files/MultiMC/libraries/org/ow2/asm/asm/8.0/asm-8.0.jar
D:/Program Files/MultiMC/libraries/org/ow2/asm/asm-analysis/8.0/asm-analysis-8.0.jar
D:/Program Files/MultiMC/libraries/org/ow2/asm/asm-commons/8.0/asm-commons-8.0.jar
D:/Program Files/MultiMC/libraries/org/ow2/asm/asm-tree/8.0/asm-tree-8.0.jar
D:/Program Files/MultiMC/libraries/org/ow2/asm/asm-util/8.0/asm-util-8.0.jar
D:/Program Files/MultiMC/libraries/net/fabricmc/fabric-loader/0.9.1+build.205/fabric-loader-0.9.1+build.205.jar
D:/Program Files/MultiMC/libraries/com/mojang/minecraft/1.16.1/minecraft-1.16.1-client.jar

Native libraries:
D:/Program Files/MultiMC/libraries/org/lwjgl/lwjgl-glfw/3.2.2/lwjgl-glfw-3.2.2-natives-windows.jar
D:/Program Files/MultiMC/libraries/org/lwjgl/lwjgl-jemalloc/3.2.2/lwjgl-jemalloc-3.2.2-natives-windows.jar
D:/Program Files/MultiMC/libraries/org/lwjgl/lwjgl-openal/3.2.2/lwjgl-openal-3.2.2-natives-windows.jar
D:/Program Files/MultiMC/libraries/org/lwjgl/lwjgl-opengl/3.2.2/lwjgl-opengl-3.2.2-natives-windows.jar
D:/Program Files/MultiMC/libraries/org/lwjgl/lwjgl-stb/3.2.2/lwjgl-stb-3.2.2-natives-windows.jar
D:/Program Files/MultiMC/libraries/org/lwjgl/lwjgl-tinyfd/3.2.2/lwjgl-tinyfd-3.2.2-natives-windows.jar
D:/Program Files/MultiMC/libraries/org/lwjgl/lwjgl/3.2.2/lwjgl-3.2.2-natives-windows.jar
D:/Program Files/MultiMC/libraries/com/mojang/text2speech/1.11.3/text2speech-1.11.3-natives-windows.jar

Mods:
[✔️] fabric-api-0.17.0+build.386-1.16.1
[✔️] trinket-heart-canisters-1.0.0
[✔️] trinkets-2.6.4

Params:
--username --version MultiMC5 --gameDir D:/Program Files/MultiMC/instances/单独排查/.minecraft --assetsDir D:/Program Files/MultiMC/assets --assetIndex 1.16 --uuid --accessToken --userType --versionType release

Window size: max (if available)

Java Arguments:
[-XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump, -Xms512m, -Xmx2500m, -Duser.language=en]

Minecraft进程ID：13384

Using onesix launcher.

[10:56:08] [main/INFO]: Loading for game Minecraft 1.16.1
[10:56:08] [main/INFO]: [FabricLoader] Loading 45 mods: [email protected], [email protected]+97324d1102, [email protected]+eae12eb802, [email protected]+b50ffc7b02, [email protected]+3fa9f7c502, [email protected]+5ce5339802, [email protected], [email protected]+build.205, [email protected]+91fca5cd02, [email protected]+34d6c87102, [email protected]+045df74f02, [email protected]+2242e77202, [email protected]+a71b305302, [email protected]+059ea86602, [email protected]+16acbe5b02, [email protected]+b7f9825d02, [email protected]+7066030f02, [email protected]+fe81e12502, [email protected]+12a8474c02, [email protected]+5341049002, [email protected]+346247d702, [email protected]+f404f3be02, [email protected]+b7f9825d02, [email protected]+f41e209802, [email protected], [email protected]+eae12eb802, [email protected]+059ea86602, [email protected]+a4c57d8e02, [email protected]+b7084faa02, [email protected], [email protected]+7dba2d6c02, [email protected]+52d3083602, [email protected], [email protected]+c6a8ea8902, [email protected]+e83e061c02, [email protected]+b764ce9902, [email protected]+be551d3c02, [email protected]+386eb69e02, [email protected]+16acbe5b02, [email protected]+build.386-1.16.1, [email protected]+dfdb52d602, [email protected]+0a6f2a7002, [email protected]+438f963602, [email protected]+e00ecb5f02, [email protected]+a2d21ddd02
[10:56:08] [main/INFO]: SpongePowered MIXIN Subsystem Version=0.8.1 Source=file:/D:/Program%20Files/MultiMC/libraries/net/fabricmc/sponge-mixin/0.8.1+build.21/sponge-mixin-0.8.1+build.21.jar Service=Knot/Fabric Env=CLIENT
[10:56:12] [main/WARN]: Error loading class: net/minecraft/class_5414 (java.lang.ClassNotFoundException: net/minecraft/class_5414)
org.spongepowered.asm.mixin.transformer.throwables.MixinPreProcessorException: Attach error for trinketheartcanisters.mixins.json:LivingEntityMixin during activity: [Transform -> Method dropLoot(Lnet/minecraft/class_1282;ZLorg/spongepowered/asm/mixin/injection/callback/CallbackInfo;)V -> INVOKEINTERFACE -> net/minecraft/class_5414::method_30210(Lnet/minecraft/class_2960;)Lnet/minecraft/class_3494;]
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.attach(MixinPreProcessorStandard.java:300)
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.createContextFor(MixinPreProcessorStandard.java:264)
at org.spongepowered.asm.mixin.transformer.MixinInfo.createContextFor(MixinInfo.java:1272)
at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.apply(MixinApplicatorStandard.java:287)
at org.spongepowered.asm.mixin.transformer.TargetClassContext.applyMixins(TargetClassContext.java:345)
at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:570)
at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:351)
at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClass(MixinTransformer.java:191)
at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClassBytes(MixinTransformer.java:178)
at org.spongepowered.asm.mixin.transformer.FabricMixinTransformerProxy.transformClassBytes(FabricMixinTransformerProxy.java:23)
at net.fabricmc.loader.launch.knot.KnotClassDelegate.getPostMixinClassByteArray(KnotClassDelegate.java:157)
at net.fabricmc.loader.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:143)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
at java.base/java.lang.ClassLoader.defineClass1(Native Method)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1017)
at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:151)
at net.fabricmc.loader.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:156)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
at net.minecraft.class_2246.(class_2246.java:100)
at net.minecraft.class_2378.method_10237(class_2378.java:169)
at net.minecraft.class_2378.method_29110(class_2378.java:220)
at java.base/java.util.LinkedHashMap.forEach(LinkedHashMap.java:723)
at net.minecraft.class_2378.(class_2378.java:219)
at net.minecraft.class_2966.method_12851(class_2966.java:41)
at net.minecraft.client.main.Main.main(Main.java:137)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at net.fabricmc.loader.game.MinecraftGameProvider.launch(MinecraftGameProvider.java:192)
at net.fabricmc.loader.launch.knot.Knot.init(Knot.java:140)
at net.fabricmc.loader.launch.knot.KnotClient.main(KnotClient.java:26)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:196)
at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:231)
at org.multimc.EntryPoint.listen(EntryPoint.java:143)
at org.multimc.EntryPoint.main(EntryPoint.java:34)
Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException: net.minecraft.class_5414
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.transformMemberReference(MixinPreProcessorStandard.java:768)
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.transformMethod(MixinPreProcessorStandard.java:754)
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.transform(MixinPreProcessorStandard.java:720)
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.attach(MixinPreProcessorStandard.java:294)
... 39 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.class_5414
... 43 more
Failed to start Minecraft:
java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.multimc.onesix.OneSixLauncher.launchWithMainClass(OneSixLauncher.java:196)
at org.multimc.onesix.OneSixLauncher.launch(OneSixLauncher.java:231)
at org.multimc.EntryPoint.listen(EntryPoint.java:143)
at org.multimc.EntryPoint.main(EntryPoint.java:34)
Caused by: java.lang.RuntimeException: java.lang.reflect.InvocationTargetException
at net.fabricmc.loader.game.MinecraftGameProvider.launch(MinecraftGameProvider.java:194)
at net.fabricmc.loader.launch.knot.Knot.init(Knot.java:140)
at net.fabricmc.loader.launch.knot.KnotClient.main(KnotClient.java:26)
... 8 more
Caused by: java.lang.reflect.InvocationTargetException
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at net.fabricmc.loader.game.MinecraftGameProvider.launch(MinecraftGameProvider.java:192)
... 10 more
Caused by: org.spongepowered.asm.mixin.transformer.throwables.MixinTransformerError: An unexpected critical error was encountered
at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:364)
at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClass(MixinTransformer.java:191)
at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClassBytes(MixinTransformer.java:178)
at org.spongepowered.asm.mixin.transformer.FabricMixinTransformerProxy.transformClassBytes(FabricMixinTransformerProxy.java:23)
at net.fabricmc.loader.launch.knot.KnotClassDelegate.getPostMixinClassByteArray(KnotClassDelegate.java:157)
at net.fabricmc.loader.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:143)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
at java.base/java.lang.ClassLoader.defineClass1(Native Method)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1017)
at java.base/java.security.SecureClassLoader.defineClass(SecureClassLoader.java:151)
at net.fabricmc.loader.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:156)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:522)
at net.minecraft.class_2246.(class_2246.java:100)
at net.minecraft.class_2378.method_10237(class_2378.java:169)
at net.minecraft.class_2378.method_29110(class_2378.java:220)
at java.base/java.util.LinkedHashMap.forEach(LinkedHashMap.java:723)
at net.minecraft.class_2378.(class_2378.java:219)
at net.minecraft.class_2966.method_12851(class_2966.java:41)
at net.minecraft.client.main.Main.main(Main.java:137)
... 15 more
Caused by: org.spongepowered.asm.mixin.transformer.throwables.MixinPreProcessorException: Attach error for trinketheartcanisters.mixins.json:LivingEntityMixin during activity: [Transform -> Method dropLoot(Lnet/minecraft/class_1282;ZLorg/spongepowered/asm/mixin/injection/callback/CallbackInfo;)V -> INVOKEINTERFACE -> net/minecraft/class_5414::method_30210(Lnet/minecraft/class_2960;)Lnet/minecraft/class_3494;]
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.attach(MixinPreProcessorStandard.java:300)
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.createContextFor(MixinPreProcessorStandard.java:264)
at org.spongepowered.asm.mixin.transformer.MixinInfo.createContextFor(MixinInfo.java:1272)
at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.apply(MixinApplicatorStandard.java:287)
at org.spongepowered.asm.mixin.transformer.TargetClassContext.applyMixins(TargetClassContext.java:345)
at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:570)
at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:351)
... 33 more
Caused by: java.lang.RuntimeException: java.lang.ClassNotFoundException: net.minecraft.class_5414
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.transformMemberReference(MixinPreProcessorStandard.java:768)
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.transformMethod(MixinPreProcessorStandard.java:754)
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.transform(MixinPreProcessorStandard.java:720)
at org.spongepowered.asm.mixin.transformer.MixinPreProcessorStandard.attach(MixinPreProcessorStandard.java:294)
... 39 more
Caused by: java.lang.ClassNotFoundException: net.minecraft.class_5414
... 43 more
Exiting with -1

hmm, this might be because you're running on 1.16.1 instead of 1.16.2, when I get the chance I'll see if I can figure that out

hmm, this might be because you're running on 1.16.1 instead of 1.16.2, when I get the chance I'll see if I can figure that out

It might be great to have a 1.16.1 version for temporary use if the back port is not very complicated. It appears to have weeks before most of mods update to 1.16.2.