Incompatible with Sodium in 1.21.1-0.4.1?

[Chaos02]

Placed a vertical slab, game immediately crashed.

Mod Versions:
1.21.1-0.4.1

-a---- 14.06.2026 14:26 1297761 sodium-fabric-0.6.13+mc1.21.1.jar
-a---- 14.06.2026 14:26 43925 sodiumcoreshadersupport-1.3.4-mc1.21.1-sodium0.6.13-fabric.jar
-a---- 14.06.2026 14:26 899434 sodiumdynamiclights-fabric-1.0.10-1.21.1.jar
-a---- 14.06.2026 14:26 876916 sodiumextras-fabric-1.0.8-1.21.1.jar
-a---- 14.06.2026 14:26 299711 sodiumleafculling-fabric-1.0.1-1.21.1.jar

[21:40:43] [Chunk Render Task Executor #8] [ChunkBuilder/ERROR]: Chunk build failed
net.minecraft.class_148: Encountered exception while building chunk meshes
        at knot//net.caffeinemc.mods.sodium.client.render.chunk.compile.tasks.ChunkBuilderMeshingTask.fillCrashInfo(ChunkBuilderMeshingTask.java:215)
        at knot//net.caffeinemc.mods.sodium.client.render.chunk.compile.tasks.ChunkBuilderMeshingTask.execute(ChunkBuilderMeshingTask.java:144)
        at knot//net.caffeinemc.mods.sodium.client.render.chunk.compile.tasks.ChunkBuilderMeshingTask.execute(ChunkBuilderMeshingTask.java:50)
        at knot//net.caffeinemc.mods.sodium.client.render.chunk.compile.executor.ChunkJobTyped.execute(ChunkJobTyped.java:45)
        at knot//net.caffeinemc.mods.sodium.client.render.chunk.compile.executor.ChunkBuilder$WorkerRunnable.run(ChunkBuilder.java:213)
        at java.base/java.lang.Thread.run(Thread.java:1583)
Caused by: java.lang.IllegalArgumentException: Cannot get property class_2754{name=type, clazz=class net.minecraft.class_2771, values=[top, bottom, double]} as it does not exist in Block{doubleslabs:vertical_slab}
        at knot//net.minecraft.class_2688.method_11654(class_2688.java:97)
        at knot//malte0811.ferritecore.impl.KeyValueConditionImpl.lambda$getBlockStatePredicate$1(KeyValueConditionImpl.java:86)
        at knot//net.minecraft.class_1095.emitBlockQuads(class_1095.java:583)
        at knot//cjminecraft.doubleslabs.fabric.client.model.VerticalSlabBakedModel.lambda$emitBlockQuads$0(VerticalSlabBakedModel.java:45)

[Gbergz]

Can confirm this, any updates to this perhaps? @CJMinecraft01

[erutobusiness]

Same crash on Forge 1.20.1 / DoubleSlabs 0.2.0 with Embeddium 0.3.31 (Sodium fork), so this is not limited to 1.21.1 + Fabric Sodium.

Placing a vertical slab crashed the client instantly, and because it happens during chunk meshing it crashes again every time that chunk is rendered.

java.lang.NullPointerException: Cannot invoke "net.minecraft.client.resources.model.BakedModel.getRenderTypes(...)" because "model" is null
	at cjminecraft.doubleslabs.forge.client.model.VerticalSlabBakedModel.lambda$getQuads$0(VerticalSlabBakedModel.java:62)
	at cjminecraft.doubleslabs.api.state.IDynamicSlabStateContainer.lambda$runOnBlockStates$1(IDynamicSlabStateContainer.java:37)
	at cjminecraft.doubleslabs.api.state.ISlabStateContainer.runOnBlockState(ISlabStateContainer.java:38)
	at cjminecraft.doubleslabs.api.state.IDynamicSlabStateContainer.lambda$runOnBlockStates$2(IDynamicSlabStateContainer.java:37)
	at cjminecraft.doubleslabs.common.block.entity.DynamicSlabBlockEntity.runOnStateContainers(DynamicSlabBlockEntity.java:71)
	at cjminecraft.doubleslabs.api.state.IDynamicSlabStateContainer.runOnBlockStates(IDynamicSlabStateContainer.java:37)
	at cjminecraft.doubleslabs.forge.client.model.VerticalSlabBakedModel.getQuads(VerticalSlabBakedModel.java:51)
	at ...sodium.client.render.chunk.compile.pipeline.BlockRenderer.getGeometry(BlockRenderer.java:147)   [embeddium-0.3.31+mc1.20.1]

-- Block being rendered --
	Block: Block{doubleslabs:vertical_slab}[axis=z,type=positive,waterlogged=false]

The block survived in the world, so here is what was actually inside it (read from the dedicated server with /data get block):

{id: "doubleslabs:dynamic_slab",
 positive: {state: {Name: "minecraft:cut_copper_slab",
                    Properties: {type: "top", waterlogged: "false"}}},
 negative: {}}

Two details that may help narrow it down:

1. No baking failure was logged. At startup the only DoubleSlabs lines were
   Baked vertical slab models for 1751 slabs and Baked vertical slab item models for 1750 slabs;
   Cannot bake vertical slab model for ... as it does not use a block model appeared 0 times.
2. The NPE is thrown in VerticalSlabBakedModel, i.e. VerticalSlabModelHelper.getVerticalSlabModel(state, direction)
   returned null without throwing inside the helper itself. If the state key were missing from
   verticalModels, the NPE would happen inside VerticalSlabModelHelper instead (that is the shape of
   the crash in Vertical slabs crash the game when placed in water (and prevent reloading world) #311 / Crashed my game when I put down a vertical slab in water. #314), so the per-state EnumMap<Direction, BakedModel> seems to be missing the
   direction that was asked for.

Environment: Minecraft 1.20.1, Forge 47.4.x, DoubleSlabs 0.2.0, Embeddium 0.3.31, Oculus, large modpack
(~1750 slab blocks registered, mostly from Chipped / ChippedExtras).

Note for other 1.20.1 Forge users who hit this: the latest Forge 1.20.1 build is 0.2.0, and 0.2.1–0.2.3 are
Fabric-only, so there is no updated build to move to. Since there is also no config option to turn vertical
slabs off (#251, #252), we hid doubleslabs:vertical_slab from the recipe viewer on our server and removed
the placed block with /setblock to make the area loadable again.