I found a crash scenario that I suspect involves this mod and Botania, and potentially other mods that add persistent potion effects through equipped items. Playing Valhelsia 3.

1. Equip a Ring of the Mantle and a source of mana
2. Open inventory and click the Haste II effect
3. Game crashes with an error reporting "Unidentified Potion Effect"

Can you send me a crash report?

Sure, happy to send it
crash-2021-12-23_15.15.44-client.txt