If you leave the wixies for a bit , they stop working on the potions even when they have materials and jars, and if you point at the cauldron it says , Crafting:air

I am having trouble recreating this one, is this happening for all potions? Any in specific?

Did you perhaps click with an empty hand on the jar? That would cause them delete their recipe on world restart, I have just discovered.

Sorry for the late response .I was making potion of fire ressistance and awkward potion ,

Did you perhaps click with an empty hand on the jar? That would cause them delete their recipe on world restart, I have just discovered.

Dont remember , i will test it maybe thats the issue , i just notice that in the top left corner is a messege
Crafting:air

Try 1.15.1, this issue should be fixed.