
Basically, my map compiles fine - no leaks or other errors. Maybe some "degenerate patch" errors or similar stuff but nothing that`s really harmful. But when I go in game, I noticed the problems above.
The really strange thing is that not all the metal trim textures act like this. The square trim and straight trim in the center behave as if they are non-solid shaders, but the columns the top right arrow points to work fine, although they all use the same texture. All other instances of this texture not shown in the screenshot also work as expected. The affected brushes can be walked through / passed through by both players and weapon projectiles, as the image demonstrates. Note that all other surfaces of the affected brushes use regular textures without any shaders applied. I am using a default gothic metal trim here with no special nonsolid surface parameter shaders. This problem is really bizarre, I wonder if anyone has had this problem before, what caused it, and how they fixed it.