I've implemented a custom fluid block transform that outputs a custom block made in contenttweaker. The textures seem to be working fine in all other implementations except for when it's inside the barrel. You can see it in my hand, inventory, in world, and in that crystal chest from iron chests. I can obtain the block out of the barrel just fine, it's only the texture while in the barrel. Any insights would be greatly appreciated as this is not only my first multi-textured block, but also my first custom fluid block transform. Let me know if you need more details!

Custom Textures:

Contenttweaker script: https://pastebin.com/jPjdyLKQ
Contenttweaker Lang: https://pastebin.com/6wQEL8b9
Blockstate json: https://pastebin.com/GzRgcq2G
Model json: https://pastebin.com/eGD6GGvJ