Version Info

• Minecraft, 1.21.8 (latest)
• Fusion, fusion-1.2.10-forge-mc1.21.6 (latest on modrinth)

What mod loader are you using?: Forge

Are you using OptiFine: No

Steps to Reproduce

Boot up minecraft with the Fusion mod.
Have the "Fusion Block Transitions v1.0.1 for Minecraft 1.20-1.21.8.zip" resource enabled or enable it later.
Launch a world.
The game crashes the second the resource is enabled either during world load or with a manual resource load.

This has been tested with a modpack as well as with only the fusion mod.

Crash report (~/logs/latest.log)

crash-log.txt

"[05/08/2025 18:51:33 p. m.] java.lang.IllegalArgumentException: Collection is empty
[05/08/2025 18:51:33 p. m.] 	at java.base/java.util.EnumSet.copyOf(EnumSet.java:177) ~[?:?]
[05/08/2025 18:51:33 p. m.] 	at TRANSFORMER/[email protected]/com.supermartijn642.fusion.model.modifiers.block.BlockModelModifierBakedModel.getRenderTypes(BlockModelModifierBakedModel.java:94) ~[fusion-1.2.10-forge-mc1.21.6.jar!/:?]"

I have fixed the issue now in Fusion version 1.2.10a for Forge 1.21.6 - 1.21.8.
Thank you for reporting the issue!