https://vanilla-twinhead.twinstar.cz/?search=fishing#issuesHows fishing, All fine and dandy?
As you can see there are a few issues with fishing. Not the mechanic itself, but with the STV event.
https://vanilla-twinhead.twinstar.cz/?item=5634#issuesAnd does Free Action Potion work as intented?
Keep up the good work.
Here is a list of repoted bug and solved issue for FAPs.
For questions about spells I suggest you try out getting used to Twinhead. There you can easily look up all related known issues. If there are any. Or report new ones if you find them.