I've seen a 5 year old bug report marked "OPEN" for this, but it is locked.
Sims reset every time they craft a herbal remedy with the herbalism skill.
They will stand by the grill, brew the remed...
Ideas
Where's the "me too" button? This bug has been going on for years and it makes herbal remedies just more bother than they're worth. I also don't have any mods, never have, and the bug with herbal remedies has been there since I had a lot fewer packs than I do now, so I don't think it's a pack interaction issue.