supplementaries-1.20-2.5.1.jar
Forge 46.0.13
Minecraft 1.20

I think the reason why it's crashed because of the renders of hanging signs overlay which got removed from the mod.

Crash log:
---- Minecraft Crash Report ----
// Surprise! Haha. Well, this is awkward.

Time: 2023-06-11 10:43:56
Description: Rendering overlay

java.lang.IllegalStateException: Failed to create model for minecraft:hanging_sign
at net.minecraft.client.renderer.blockentity.BlockEntityRenderers.m_257086_(BlockEntityRenderers.java:26) ~[client-1.20-20230608.053357-srg.jar%23372!/:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at java.util.concurrent.ConcurrentHashMap.forEach(ConcurrentHashMap.java:1603) ~[?:?] {}
at net.minecraft.client.renderer.blockentity.BlockEntityRenderers.m_173598_(BlockEntityRenderers.java:22) ~[client-1.20-20230608.053357-srg.jar%23372!/:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.client.renderer.blockentity.BlockEntityRenderDispatcher.m_6213_(BlockEntityRenderDispatcher.java:125) ~[client-1.20-20230608.053357-srg.jar%23372!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:supplementaries.mixins.json:BlockEntityRendererDispatcherMixin,pl:mixin:A}
at net.minecraft.server.packs.resources.ResourceManagerReloadListener.m_10759_(ResourceManagerReloadListener.java:15) ~[client-1.20-20230608.053357-srg.jar%23372!/:?] {re:classloading,re:mixin}
at java.util.concurrent.CompletableFuture$UniRun.tryFire(CompletableFuture.java:787) ~[?:?] {}
at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:482) ~[?:?] {}
at net.minecraft.server.packs.resources.SimpleReloadInstance.m_143940_(SimpleReloadInstance.java:69) ~[client-1.20-20230608.053357-srg.jar%23372!/:?] {re:classloading}
at net.minecraft.util.thread.BlockableEventLoop.m_6367_(BlockableEventLoop.java:156) ~[client-1.20-20230608.053357-srg.jar%23372!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B}
at net.minecraft.util.thread.ReentrantBlockableEventLoop.m_6367_(ReentrantBlockableEventLoop.java:23) ~[client-1.20-20230608.053357-srg.jar%23372!/:?] {re:mixin,re:computing_frames,re:classloading}
at net.minecraft.util.thread.BlockableEventLoop.m_7245_(BlockableEventLoop.java:130) ~[client-1.20-20230608.053357-srg.jar%23372!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B}
at net.minecraft.util.thread.BlockableEventLoop.m_18699_(BlockableEventLoop.java:115) ~[client-1.20-20230608.053357-srg.jar%23372!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B}
at net.minecraft.client.Minecraft.m_91383_(Minecraft.java:1106) ~[client-1.20-20230608.053357-srg.jar%23372!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:architectury.mixins.json:MixinMinecraft,pl:mixin:APP:fallingleaves.mixins.json:MinecraftClientMixin,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.m_91374_(Minecraft.java:718) ~[client-1.20-20230608.053357-srg.jar%23372!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:architectury.mixins.json:MixinMinecraft,pl:mixin:APP:fallingleaves.mixins.json:MinecraftClientMixin,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.main.Main.main(Main.java:218) ~[1.20-forge-46.0.13.jar:?] {re:classloading,pl:runtimedistcleaner:A}
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?] {}
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[?:?] {}
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?] {}
at java.lang.reflect.Method.invoke(Method.java:568) ~[?:?] {}
at net.minecraftforge.fml.loading.targets.CommonClientLaunchHandler.lambda$launchService$0(CommonClientLaunchHandler.java:28) ~[fmlloader-1.20-46.0.13.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:30) ~[modlauncher-10.0.8.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:53) ~[modlauncher-10.0.8.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:71) ~[modlauncher-10.0.8.jar:?] {}
at cpw.mods.modlauncher.Launcher.run(Launcher.java:106) ~[modlauncher-10.0.8.jar:?] {}
at cpw.mods.modlauncher.Launcher.main(Launcher.java:77) ~[modlauncher-10.0.8.jar:?] {}
at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26) ~[modlauncher-10.0.8.jar:?] {}
at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23) ~[modlauncher-10.0.8.jar:?] {}
at cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:141) ~[bootstraplauncher-1.1.2.jar:?] {}
Caused by: java.lang.IllegalArgumentException: No model for layer supplementaries:hanging_sign_extension#hanging_sign_extension
at net.minecraft.client.model.geom.EntityModelSet.m_171103_(EntityModelSet.java:17) ~[client-1.20-20230608.053357-srg.jar%23372!/:?] {re:classloading}
at net.minecraft.client.renderer.blockentity.BlockEntityRendererProvider$Context.m_173582_(BlockEntityRendererProvider.java:52) ~[client-1.20-20230608.053357-srg.jar%23372!/:?] {re:mixin,re:classloading}
at net.minecraft.client.renderer.blockentity.HangingSignRenderer.handler$zef000$initEnhancedSign(HangingSignRenderer.java:569) ~[client-1.20-20230608.053357-srg.jar%23372!/:?] {re:mixin,re:classloading,pl:mixin:APP:supplementaries-common.mixins.json:HangingSignRendererMixin,pl:mixin:A}
at net.minecraft.client.renderer.blockentity.HangingSignRenderer.(HangingSignRenderer.java:58) ~[client-1.20-20230608.053357-srg.jar%23372!/:?] {re:mixin,re:classloading,pl:mixin:APP:supplementaries-common.mixins.json:HangingSignRendererMixin,pl:mixin:A}
at net.minecraft.client.renderer.blockentity.BlockEntityRenderers.m_257086_(BlockEntityRenderers.java:24) ~[client-1.20-20230608.053357-srg.jar%23372!/:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
... 27 more

A detailed walkthrough of the error, its code path and all known details is as follows:

-- Head --
Thread: Render thread
Stacktrace:
at net.minecraft.client.renderer.blockentity.BlockEntityRenderers.m_257086_(BlockEntityRenderers.java:26) ~[client-1.20-20230608.053357-srg.jar%23372!/:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at java.util.concurrent.ConcurrentHashMap.forEach(ConcurrentHashMap.java:1603) ~[?:?] {}
at net.minecraft.client.renderer.blockentity.BlockEntityRenderers.m_173598_(BlockEntityRenderers.java:22) ~[client-1.20-20230608.053357-srg.jar%23372!/:?] {re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
at net.minecraft.client.renderer.blockentity.BlockEntityRenderDispatcher.m_6213_(BlockEntityRenderDispatcher.java:125) ~[client-1.20-20230608.053357-srg.jar%23372!/:?] {re:mixin,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B,pl:mixin:APP:supplementaries.mixins.json:BlockEntityRendererDispatcherMixin,pl:mixin:A}
at net.minecraft.server.packs.resources.ResourceManagerReloadListener.m_10759_(ResourceManagerReloadListener.java:15) ~[client-1.20-20230608.053357-srg.jar%23372!/:?] {re:classloading,re:mixin}
at java.util.concurrent.CompletableFuture$UniRun.tryFire(CompletableFuture.java:787) ~[?:?] {}
at java.util.concurrent.CompletableFuture$Completion.run(CompletableFuture.java:482) ~[?:?] {}
at net.minecraft.server.packs.resources.SimpleReloadInstance.m_143940_(SimpleReloadInstance.java:69) ~[client-1.20-20230608.053357-srg.jar%23372!/:?] {re:classloading}
at net.minecraft.util.thread.BlockableEventLoop.m_6367_(BlockableEventLoop.java:156) ~[client-1.20-20230608.053357-srg.jar%23372!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B}
at net.minecraft.util.thread.ReentrantBlockableEventLoop.m_6367_(ReentrantBlockableEventLoop.java:23) ~[client-1.20-20230608.053357-srg.jar%23372!/:?] {re:mixin,re:computing_frames,re:classloading}
at net.minecraft.util.thread.BlockableEventLoop.m_7245_(BlockableEventLoop.java:130) ~[client-1.20-20230608.053357-srg.jar%23372!/:?] {re:mixin,pl:accesstransformer:B,re:computing_frames,pl:accesstransformer:B,re:classloading,pl:accesstransformer:B}
-- Overlay render details --
Details:
Overlay name: net.minecraft.client.gui.screens.LoadingOverlay
Stacktrace:
at net.minecraft.client.renderer.GameRenderer.m_109093_(GameRenderer.java:957) ~[client-1.20-20230608.053357-srg.jar%23372!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:supplementaries-common.mixins.json:GameRendererMixin,pl:mixin:APP:jade.mixins.json:GameRendererMixin,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.m_91383_(Minecraft.java:1146) ~[client-1.20-20230608.053357-srg.jar%23372!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:architectury.mixins.json:MixinMinecraft,pl:mixin:APP:fallingleaves.mixins.json:MinecraftClientMixin,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.Minecraft.m_91374_(Minecraft.java:718) ~[client-1.20-20230608.053357-srg.jar%23372!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:architectury.mixins.json:MixinMinecraft,pl:mixin:APP:fallingleaves.mixins.json:MinecraftClientMixin,pl:mixin:A,pl:runtimedistcleaner:A}
at net.minecraft.client.main.Main.main(Main.java:218) ~[1.20-forge-46.0.13.jar:?] {re:classloading,pl:runtimedistcleaner:A}
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?] {}
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77) ~[?:?] {}
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?] {}
at java.lang.reflect.Method.invoke(Method.java:568) ~[?:?] {}
at net.minecraftforge.fml.loading.targets.CommonClientLaunchHandler.lambda$launchService$0(CommonClientLaunchHandler.java:28) ~[fmlloader-1.20-46.0.13.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandlerDecorator.launch(LaunchServiceHandlerDecorator.java:30) ~[modlauncher-10.0.8.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:53) ~[modlauncher-10.0.8.jar:?] {}
at cpw.mods.modlauncher.LaunchServiceHandler.launch(LaunchServiceHandler.java:71) ~[modlauncher-10.0.8.jar:?] {}
at cpw.mods.modlauncher.Launcher.run(Launcher.java:106) ~[modlauncher-10.0.8.jar:?] {}
at cpw.mods.modlauncher.Launcher.main(Launcher.java:77) ~[modlauncher-10.0.8.jar:?] {}
at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:26) ~[modlauncher-10.0.8.jar:?] {}
at cpw.mods.modlauncher.BootstrapLaunchConsumer.accept(BootstrapLaunchConsumer.java:23) ~[modlauncher-10.0.8.jar:?] {}
at cpw.mods.bootstraplauncher.BootstrapLauncher.main(BootstrapLauncher.java:141) ~[bootstraplauncher-1.1.2.jar:?] {}

-- Last reload --
Details:
Reload number: 1
Reload reason: initial
Finished: No
Packs: vanilla

-- System Details --
Details:
Minecraft Version: 1.20
Minecraft Version ID: 1.20
Operating System: Windows 11 (amd64) version 10.0
Java Version: 17.0.3, Microsoft
Java VM Version: OpenJDK 64-Bit Server VM (mixed mode), Microsoft
Memory: 1609979152 bytes (1535 MiB) / 2147483648 bytes (2048 MiB) up to 6442450944 bytes (6144 MiB)
CPUs: 8
Processor Vendor: GenuineIntel
Processor Name: 11th Gen Intel(R) Core(TM) i5-1135G7 @ 2.40GHz
Identifier: Intel64 Family 6 Model 140 Stepping 1
Microarchitecture: Tiger Lake
Frequency (GHz): 2.42
Number of physical packages: 1
Number of physical CPUs: 4
Number of logical CPUs: 8
Graphics card #0 name: Intel(R) Iris(R) Xe Graphics
Graphics card #0 vendor: Intel Corporation (0x8086)
Graphics card #0 VRAM (MB): 1024.00
Graphics card #0 deviceId: 0x9a49
Graphics card #0 versionInfo: DriverVersion=31.0.101.4146
Memory slot #0 capacity (MB): 8192.00
Memory slot #0 clockSpeed (GHz): 3.20
Memory slot #0 type: DDR4
Virtual memory max (MB): 27556.38
Virtual memory used (MB): 18498.94
Swap memory total (MB): 19666.27
Swap memory used (MB): 3714.24
JVM Flags: 13 total; -XX:+UnlockExperimentalVMOptions -XX:+UseG1GC -XX:G1NewSizePercent=20 -XX:G1ReservePercent=20 -XX:MaxGCPauseMillis=50 -XX:G1HeapRegionSize=32M -XX:+DisableExplicitGC -XX:+AlwaysPreTouch -XX:+ParallelRefProcEnabled -Xms2048M -Xmx6144M -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xss2M
Launched Version: 1.20-forge-46.0.13
Backend library: LWJGL version 3.3.1 build 7
Backend API: Intel(R) Iris(R) Xe Graphics GL version 3.2.0 - Build 31.0.101.4146, Intel
Window size: 925x530
GL Caps: Using framebuffer using OpenGL 3.2
GL debug messages:
Using VBOs: Yes
Is Modded: Definitely; Client brand changed to 'forge'
Type: Client (map_client.txt)
Graphics mode: fancy
Resource Packs:
Current Language: en_us
CPU: 8x 11th Gen Intel(R) Core(TM) i5-1135G7 @ 2.40GHz
ModLauncher: 10.0.8+10.0.8+main.0ef7e830
ModLauncher launch target: forgeclient
ModLauncher naming: srg
ModLauncher services:
mixin-0.8.5.jar mixin PLUGINSERVICE
eventbus-6.0.3.jar eventbus PLUGINSERVICE
fmlloader-1.20-46.0.13.jar slf4jfixer PLUGINSERVICE
fmlloader-1.20-46.0.13.jar object_holder_definalize PLUGINSERVICE
fmlloader-1.20-46.0.13.jar runtime_enum_extender PLUGINSERVICE
fmlloader-1.20-46.0.13.jar capability_token_subclass PLUGINSERVICE
accesstransformers-8.0.4.jar accesstransformer PLUGINSERVICE
fmlloader-1.20-46.0.13.jar runtimedistcleaner PLUGINSERVICE
modlauncher-10.0.8.jar mixin TRANSFORMATIONSERVICE
modlauncher-10.0.8.jar fml TRANSFORMATIONSERVICE
FML Language Providers:
[email protected]
javafml@null
[email protected]
lowcodefml@null
Mod List:
client-1.20-20230608.053357-srg.jar |Minecraft |minecraft |1.20 |NONE |Manifest: a1:d4:5e:04:4f:d3:d6:e0:7b:37:97:cf:77:b0:de:ad:4a:47:ce:8c:96:49:5f:0a:cf:8c:ae:b2:6d:4b:8a:3f
forge-1.20-46.0.13-universal.jar |Forge |forge |46.0.13 |NONE |Manifest: 84:ce:76:e8:45:35:e4:0e:63:86:df:47:59:80:0f:67:6c:c1:5f:6e:5f:4d:b3:54:47:1a:9f:7f:ed:5e:f2:90

I have the same problem in 1.20.
Using Forge 46.0.13
Log: https://crashy.net/c14ba6f8-8efa-4ab0-95fc-993c19b761a3/raw.txt