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VerifyError on LivingEntity.tickHeadTurn during Bootstrap with large modpack #863

@ehodd4

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@ehodd4

Context

Game crashes during Bootstrap (block/entity registration) with a java.lang.VerifyError: Illegal type at constant pool entry 4864 in net.minecraft.world.entity.LivingEntity.tickHeadTurn.

Crash occurs before reaching the main menu.

Environment: NeoForge 21.1.229, Minecraft 1.21.1, Java 21.0.11 (Adoptium), ~870 mods (modified Create Aeronautics modpack). Sable mods present: sable, simulated, offroad, aeronautics.

Already ruled out: Cobblemon (removed entirely, crash persists with identical constant pool index and method). The stack trace shows Sable's entity.entity_rotations_and_riding.EntityTypeMixin applied to EntityType, which triggers LivingEntity class loading where the bytecode verification fails. The high constant pool index (4864) suggests other mods are bloating LivingEntity's constant pool, then Sable's mixin references an offset that is no longer valid.

Happy to provide further logs if useful.

Crash Report

https://mclo.gs/QwUe9zL

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