[UNRESOLVED NEED MORE INFO] Walls Vanishing on multi-levels

Hi- Ive noticed that when I'm viewing a higher level, some of the walls on the levels below vanish, and equally some sections of the level below which i have placed a roof on still have the black construction zone mark when seen from the level above.  I know neither of these things effect gameplay but do frustrate the aesthetic.

Hello and thanks for the report - could you, please, upload a relevant saved game file?

By the way - mostly this issue could be mistaken as a bug - check if you have above all areas on all upper levels foundations areas built.