Thank you, Chocohead, for taking up this mantle. I am not sure exactly what is causing the issue, because, to be honest, I am very ignorant of how a lot of this mod works. I apologise if this is not very useful. I've attached the log from the crash, but here are errors that I received:

[00:27:40] [main/ERROR]: Critical injection failure: LVT in net/minecraft/class_761::method_22710(Lnet/minecraft/class_4587;FJZLnet/minecraft/class_4184;Lnet/minecraft/class_757;Lnet/minecraft/class_765;Lnet/minecraft/class_1159;)V has incompatible changes at opcode 1833 in callback net/minecraft/class_761::renderWandHighlight.
Expected: [Lnet/minecraft/class_3695;, Lnet/minecraft/class_243;, D, D, D, Lnet/minecraft/class_1159;, Z, Lnet/minecraft/class_4604;, Z, Lnet/minecraft/class_4597$class_4598;]
Found: [Lnet/minecraft/class_243;, D, D, D, Lnet/minecraft/class_1159;, Z, Lnet/minecraft/class_4604;, Z, F]
org.spongepowered.asm.mixin.injection.throwables.InjectionError: LVT in net/minecraft/class_761::method_22710(Lnet/minecraft/class_4587;FJZLnet/minecraft/class_4184;Lnet/minecraft/class_757;Lnet/minecraft/class_765;Lnet/minecraft/class_1159;)V has incompatible changes at opcode 1833 in callback net/minecraft/class_761::renderWandHighlight.
Expected: [Lnet/minecraft/class_3695;, Lnet/minecraft/class_243;, D, D, D, Lnet/minecraft/class_1159;, Z, Lnet/minecraft/class_4604;, Z, Lnet/minecraft/class_4597$class_4598;]
Found: [Lnet/minecraft/class_243;, D, D, D, Lnet/minecraft/class_1159;, Z, Lnet/minecraft/class_4604;, Z, F]
at org.spongepowered.asm.mixin.injection.callback.CallbackInjector.inject(CallbackInjector.java:487)
at org.spongepowered.asm.mixin.injection.callback.CallbackInjector.inject(CallbackInjector.java:437)
at org.spongepowered.asm.mixin.injection.code.Injector.inject(Injector.java:264)
at org.spongepowered.asm.mixin.injection.struct.InjectionInfo.inject(InjectionInfo.java:385)
at org.spongepowered.asm.mixin.transformer.MixinTargetContext.applyInjections(MixinTargetContext.java:1284)
at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.applyInjections(MixinApplicatorStandard.java:1042)
at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.applyMixin(MixinApplicatorStandard.java:395)
at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.apply(MixinApplicatorStandard.java:320)
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.lang.ClassLoader.loadClass(ClassLoader.java:351)
at net.optifine.reflect.Reflector.(Reflector.java:298)
at net.minecraft.class_128.method_559(class_128.java:101)
at net.minecraft.class_128.(class_128.java:54)
at net.minecraft.class_128.method_24305(class_128.java:413)
at net.minecraft.client.main.Main.main(Main.java:135)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
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 sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
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)
Failed to start Minecraft:
java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
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 sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
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.lang.ClassLoader.loadClass(ClassLoader.java:351)
at net.optifine.reflect.Reflector.(Reflector.java:298)
at net.minecraft.class_128.method_559(class_128.java:101)
at net.minecraft.class_128.(class_128.java:54)
at net.minecraft.class_128.method_24305(class_128.java:413)
at net.minecraft.client.main.Main.main(Main.java:135)
... 15 more
Caused by: org.spongepowered.asm.mixin.injection.throwables.InjectionError: LVT in net/minecraft/class_761::method_22710(Lnet/minecraft/class_4587;FJZLnet/minecraft/class_4184;Lnet/minecraft/class_757;Lnet/minecraft/class_765;Lnet/minecraft/class_1159;)V has incompatible changes at opcode 1833 in callback net/minecraft/class_761::renderWandHighlight.
Expected: [Lnet/minecraft/class_3695;, Lnet/minecraft/class_243;, D, D, D, Lnet/minecraft/class_1159;, Z, Lnet/minecraft/class_4604;, Z, Lnet/minecraft/class_4597$class_4598;]
Found: [Lnet/minecraft/class_243;, D, D, D, Lnet/minecraft/class_1159;, Z, Lnet/minecraft/class_4604;, Z, F]
at org.spongepowered.asm.mixin.injection.callback.CallbackInjector.inject(CallbackInjector.java:487)
at org.spongepowered.asm.mixin.injection.callback.CallbackInjector.inject(CallbackInjector.java:437)
at org.spongepowered.asm.mixin.injection.code.Injector.inject(Injector.java:264)
at org.spongepowered.asm.mixin.injection.struct.InjectionInfo.inject(InjectionInfo.java:385)
at org.spongepowered.asm.mixin.transformer.MixinTargetContext.applyInjections(MixinTargetContext.java:1284)
at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.applyInjections(MixinApplicatorStandard.java:1042)
at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.applyMixin(MixinApplicatorStandard.java:395)
at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.apply(MixinApplicatorStandard.java:320)
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)
... 26 more
Exiting with -1
Process exited with code -1.

Staff_of_Building_OptiFabric_Crash.txt

That crash is very useful, thank you for that. I'll see about this tomorrow.

Thank you so much!