An important feature, I converted this map from boom format to udmf, but with namespace=doom. Not all ports support this, but in zandronum the game works fine, except for the wrong translucency.
In GZDoom, for example, namespace=doom is not supported and the game does not work correctly, but with the translucency of the middle textures everything is fine.
Below I provide screenshots and a file for this map.
Spoiler: (Open)