interesting, I haven't encountered this because I don't work with Might and Magic IX and the FBX format, and in OBJ, all Cyrillic characters are replaced with gibberish... as I understand it.
So far, nothing has worked. I deleted all materials in Blender and tried exporting... in 2009 3ds Max, everything is visible, but after switching to 6.0, the body, eyes, and throat disappear again... what kind of nonsense is this, I don't understand... I asked for help on a 3D forum, but so far no one has responded...