When upgrading a Fireplace to Fireplace on, The Fireplace on is bugged into the Ground.
The Center Position (circle) of the FIreplace on is higher, then the circle of Fireplace of.
Tested on Tanoa
Hey @Ignatz-HeMan, could you please provide a screenshot?
Both Fireplaces was build onto the Wooden Floor. The Left one is only upgraded
This should be fixed in 0.4, if not please report back