Crash while activating wave vision inside a block in spectator

[OreoTheFur]

Just found this out randomly while trying to reach an ancient city after having transfurred into a dark latex Yufeng and having put myself in spectator

crash-2026-04-11_17.41.09-client.txt

[LtxProgrammer]

Relevant log extract (deobf):

java.lang.NullPointerException: Cannot invoke "com.mojang.blaze3d.vertex.BufferBuilder.begin(com.mojang.blaze3d.vertex.VertexFormat$Mode, com.mojang.blaze3d.vertex.VertexFormat)" because "p_112806_" is null
	at net.minecraft.client.renderer.chunk.ChunkRenderDispatcher$RenderChunk.beginLayer(ChunkRenderDispatcher.java:372) ~[client-1.20.1-20230612.114412-srg.jar%23218!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:runtimedistcleaner:A}
	at net.minecraft.client.renderer.chunk.ChunkRenderDispatcher$RenderChunk$RebuildTask.compile(ChunkRenderDispatcher.java:636) ~[client-1.20.1-20230612.114412-srg.jar%23218!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:changed.mixins.json:client.ChunkRenderDispatcherMixin,pl:mixin:A,pl:runtimedistcleaner:A}
	at net.minecraft.client.renderer.chunk.ChunkRenderDispatcher$RenderChunk$RebuildTask.doTask(ChunkRenderDispatcher.java:556) ~[client-1.20.1-20230612.114412-srg.jar%23218!/:?] {re:mixin,pl:accesstransformer:B,pl:runtimedistcleaner:A,re:classloading,pl:accesstransformer:B,pl:mixin:APP:changed.mixins.json:client.ChunkRenderDispatcherMixin,pl:mixin:A,pl:runtimedistcleaner:A}
	at net.minecraft.client.renderer.chunk.ChunkRenderDispatcher.lambda$runTask$0(ChunkRenderDispatcher.java:128) ~[client-1.20.1-20230612.114412-srg.jar%23218!/:?] {re:mixin,pl:runtimedistcleaner:A,re:classloading,pl:runtimedistcleaner:A}

The render chunk is given a null buffer builder, due to the builder pack not having a buffer for the required RenderType. The crash log does not indicate which RenderType that is, or what block is requesting that RenderType.