Chimney outline is 4x4 rather than the 2x2 it should be, which messes with trying to interact with entities next to it. They also insta-mine.

https://imgur.com/a/d2zEWKJ

That this is "normal" behavior, if you used blueprints containing mirrored buildings from 1.1 on some of the recent versions, the game would let you build them (and the underlying entity was the same mirrored entity as in 1.1 aka not a mirrored entity from 2.0).
I kept those mirrored entities in the game so that 1.1 saves would still load, but I didn't expect blueprints with those old buildings to be used.
In recent versions I cleared those mirrored buildings so they still exist in name only, but that would cause those already built entities to disappear, and leave unbuildable holes, so I added the ability to mine them back, but that's just the same 4x4 outline for everything as it's simpler to implement.

I suggest you just remove and replace these manually. As well as update your blueprints

Update: I'm dumb, patch incoming