�[m�[33m[09:52:16] [Render thread/WARN] [minecraft/ScreenManager]: Failed to create screen for menu type: environmental:slabfish_inventory
I'm assuming it could be because its isn't being registered like the Kiln and Sawmill screens in ScreenManager.
I'm not seeing any while searching through deserts in creative.
Also bone-mealing them doesn't seem to work yet, but I'm not sure if that's intended considering they're dead after all.
If you use shears to take a backpack off of a Slabfish, the item for the sweater will come off, but still render on the Slabfish. Neither of those should occur.