Boom water fog and 3D floors

[The Ultimate DooMer]

Contrary to popular belief I am still around and still working on my Hexen project. Progress is slow due to other hobbies/games but still coming on, and recently I've converted to full GZDoom and improved the RPG system a lot.

Anyway, on topic:

I recently started adding 3D floors to the maps, and soon came across a bug - the old-fashioned Boom underwater fog (670000FF etc. on the lower texture of the Transfer_Heights linedef) doesn't display in underwater sectors with 3D floors above them. Switching to software renderer makes the fog display again but ofc with no 3D floors visible.

Is this a bug, or is it one of those unfixable renderer issues like one or two other things that have been reported?

(I can use water teleports to workaround it since Boom fog >> other fog underwater IMO, but I'd prefer the genuine article if possible since some of the affected water areas have monsters in)

[Graf Zahl]

Generally, 3D floors and Boom-style deep water in the same sector don't mix well because both use completely different and interfering methods to set light level and color.

To check your specific setup, could you post a small map that shows the problem?

[The Ultimate DooMer]