Suspended In Dusk is a legendary little mapset, and which uses a number of creative tricks to create visuals which normally vanilla Doom wouldn't have.
Problem comes to hardware rendered sourceports such as GzDoom, where many of these tricks break.
Now, this could actually be addressed, if I'm understanding right, as Back To Saturn X features a fake 3D bridge done with one of those tricks, which GzDoom apparently can't render correctly, and solves by adding a full on GzDoom 3D floor to replace it.
I think it would be cool if this highly visually impressive mapset could get such a treatment for its broken effects.