I found this thread from years ago. I just started having the same problem with walls disappearing...real convenient as deadlines come (and go).
I checked duplicates (there were none). I've been pretty adept over the years troubleshooting ArchiCAD's wacky bugs (did anyone ever have the trim on a corner window extend beyond the corner because you did a SEO on the wall containing the corner window?...WTF) but this bug has been a massive time waster.
I do not see any acceptable solution to the issue. Moving the entire model, rebuilding all/section elevations, moving the entire model again and rebuilding all/section elevations every time I open the file is ridiculous.
I saw a similar thread posted here:
Sections and elevations messed up
ArchiCAD 25
Windows 10