Currently the campsites can generate with a flower pot that contains any valid flower pot plant item, which can include sequence breaking items like nether wart (quark) and twilight forest trees.

A config option could be added to allow modpack creators to blacklist/whitelist certain flower pot items, or to restrict to only vanilla plant pot items.

I've decided to just restrict the flower pots to vanilla plants only. Doing it with a config option would be a bit more effort than it's worth, especially considering I'll likely completely redo world gen in this mod once 1.18 rolls around.