Textures dissapear when moving cursor over walls and other structures.
Don’t you think it is intended to let you see where you point with your cursor?
Yes it is, but only temporarily where you hold the cursor. This ‘painted’ everything permanently transparent. Saving and reloading fixes the issue but it does re-occur at times.
Oh, ok. Then some bug I guess.
the next time it occurs, use the F12 bug reporter to report it