ALWAYS PROVIDE INFORMATION ABOUT MODLOADER (Fabric / Forge) AND MOD VERSION (For example, 1.19.2-8.2.10)
Fabric 1.21.1 (most likely applies to all versions and mod types)

Describe the bug
When taking a "liquid" out of the included backpack container, if it is a potion with multiple effects (e.g., Strength II and Invisibility), it will crash the game (despite being put into the container fine and still showing its NBT).

Steps to reproduce the bug
Add an extra mod that allows you to combine potion effects into one.
Follow the mod's process to create the custom potion.
Put the potion into the input slot to load into the backpack.
Try to unload the liquid back into the bottle.

you can do this with any mod

What is the expected behavior?
The game should not crash, and it should return the potion that was initially put in (like it shows its NBT when you hover your mouse over it in the backpack—why won’t this work?).

4. Screenshots (If applicable)