Describe the bug
Mermaid gems cannot fill the vanilla cauldron.

To Reproduce
Place a vanilla cauldron, and right-click it with a mermaid gem in hand.

Expected behavior
Cauldron filled with water.

Minecraft version
1.20.1

Mod version
1.8.4

Since mermaid gems can be used as a bucket of water in fusion shrines, I think placing these gems in a cauldron should be reasonable.