i played around with resource packs and multipart, but adding multipart to any other then the pre-defined blocks will make the game unload all resource packs.

the same happens when its not the exact same as the predefined

ie. the stone_wall blockstate files renamed to ie. oak_fence will also cause this issue.

a simmilar issue (also unloading all Resource Packs) was already shown a few days ago. this may be related.

Woud be great if this was fixed, either by just not allowing multipart, but it woud be a lot nice if we woud be allowed to use multipart how we want. just like it is with all other components. At least i dont know of anything else in the Resource Packs thats exclusive to the Offical Pack.

Also, in chat it leaves a trail like seen in screenshot-2!

Attached is a screenshot, and an example Texturepack, that contains just the "cobblestone_wall.json" file from the 1.13-pre7 assets renamed to "stone.json"