Rug appears to be incompatible with End Reborn, causing a crash on start-up

[LessThanBenji]

This is coming from 1.20.1, using Fabric 0.15.6. Rug versions 1.5.1 through 1.5.3 have been tested in a standalone environment with End Reborn versions 1.0.6 through 1.0.8 (installed alongside End Reborn Additions version 1.0.2*).

When Rug (and it's dependencies) is installed alongside End Reborn (and it's dependency), the game crashes on start-up load, with Fabric providing the below crash report.

Unsure at this stage whether Rug is incompatible with End Reborn, or if it's the other way around. Unfortunately, End Reborn does not have an issues page to report on.

As you can see in the crash report, it looks like it's got something to do with End Crystals:

"InjectionError: Critical injection failure: Redirector allowPlacement(Lnet/minecraft/class_2680;Lnet/minecraft/class_2248;)Z in rug.mixins.json:EndCrystalItemMixin from mod rug failed injection check, (0/1) succeeded. Scanned 1 target(s). Using refmap rug-mc1.20.1-refmap.json"*

*Minecraft has crashed!
net.fabricmc.loader.impl.FormattedException: java.lang.ExceptionInInitializerError
	at net.fabricmc.loader.impl.FormattedException.ofLocalized(FormattedException.java:63)
	at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:472)
	at net.fabricmc.loader.impl.launch.knot.Knot.launch(Knot.java:74)
	at net.fabricmc.loader.impl.launch.knot.KnotClient.main(KnotClient.java:23)
Caused by: java.lang.ExceptionInInitializerError
	at net.minecraft.class_2358.method_10199(class_2358.java:326)
	at net.minecraft.class_2966.method_12851(class_2966.java:54)
	at net.minecraft.client.main.Main.main(Main.java:166)
	at net.fabricmc.loader.impl.game.minecraft.MinecraftGameProvider.launch(MinecraftGameProvider.java:470)
	... 2 more
Caused by: java.lang.RuntimeException: Mixin transformation of net.minecraft.class_1774 failed
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.getPostMixinClassByteArray(KnotClassDelegate.java:427)
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.tryLoadClass(KnotClassDelegate.java:323)
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.loadClass(KnotClassDelegate.java:218)
	at net.fabricmc.loader.impl.launch.knot.KnotClassLoader.loadClass(KnotClassLoader.java:119)
	at java.base/java.lang.ClassLoader.loadClass(Unknown Source)
	at net.minecraft.class_6089.method_9530(class_6089.java:56)
	at net.minecraft.class_4970$class_4971.method_26172(class_4970.java:1032)
	at net.minecraft.class_4970$class_4971.method_26218(class_4970.java:1028)
	at net.minecraft.class_4970.method_9549(class_4970.java:349)
	at net.minecraft.class_4970$class_4971$class_3752.<init>(class_4970.java:1293)
	at net.minecraft.class_4970$class_4971.method_26200(class_4970.java:843)
	at net.minecraft.class_2246.<clinit>(class_2246.java:1185)
	... 6 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:392)
	at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClass(MixinTransformer.java:234)
	at org.spongepowered.asm.mixin.transformer.MixinTransformer.transformClassBytes(MixinTransformer.java:202)
	at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.getPostMixinClassByteArray(KnotClassDelegate.java:422)
	... 17 more
Caused by: org.spongepowered.asm.mixin.injection.throwables.InjectionError: Critical injection failure: Redirector allowPlacement(Lnet/minecraft/class_2680;Lnet/minecraft/class_2248;)Z in rug.mixins.json:EndCrystalItemMixin from mod rug failed injection check, (0/1) succeeded. Scanned 1 target(s). Using refmap rug-mc1.20.1-refmap.json
	at org.spongepowered.asm.mixin.injection.struct.InjectionInfo.postInject(InjectionInfo.java:468)
	at org.spongepowered.asm.mixin.transformer.MixinTargetContext.applyInjections(MixinTargetContext.java:1384)
	at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.applyInjections(MixinApplicatorStandard.java:1062)
	at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.applyMixin(MixinApplicatorStandard.java:402)
	at org.spongepowered.asm.mixin.transformer.MixinApplicatorStandard.apply(MixinApplicatorStandard.java:327)
	at org.spongepowered.asm.mixin.transformer.TargetClassContext.apply(TargetClassContext.java:421)
	at org.spongepowered.asm.mixin.transformer.TargetClassContext.applyMixins(TargetClassContext.java:403)
	at org.spongepowered.asm.mixin.transformer.MixinProcessor.applyMixins(MixinProcessor.java:363)
	... 20 more

*Testing with and without End Reborn Additions has eliminated it as the culprit -- it's one of the other two.