No bugs here, just some confusion, I think.
And also, reporting older version issues isn't worthwhile because we naturally only work on the current version.
Roasting and boiling actually require a fire - but not necessarily a fireplace/stove around it.
So these will work wherever there is fire burning - be it open fire, or sauna stove or cottage fireplace.
Now sauna stove and cottage fireplace are indeed different kind of constructions. The latter is designed for food preparation in mind.
But still, I'm fairly sure you can also bake in the sauna stove but you need to take care that it's warmed up and there's no fire burning anymore.
If there's fire burning, even in the cottage fireplace, it doesn't count a place for baking. Try and see.
But if it's so that you really can't bake anything in sauna stove, that's even better.