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java.lang.RuntimeException: Mixin transformation of net.minecraft.class_4014 failed

at net.fabricmc.loader.impl.launch.knot.KnotClassDelegate.getPostMixinClassByteArray(KnotClassDelegate.java:252) at net.fabricmc.loader.impl.launch.knot ...
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Exception in thread "Thread-0" java.lang.IllegalArgumentException: Unknown special render ...

at team.unnamed.creative.serialize.minecraft.item.ItemSerializer.readSpecial(ItemSerializer.java:354) at team.unnamed.creative.serialize.minecraft.item.ItemSerializer ...