I've been testing out AD MORTEM on GZDoom's dev builds, and it seems they've been ironing out the kinks of their MBF21 support. I immediately notice the gun sounds doesn't bug out compared to the stable version. I can't make anymore in-depth tests, as I've been busy with other things.
I encountered some kind of bug on MAP05, inside the cave part.
Here's what it looked like in Crispy Doom
And here's what it looked like on GZDoom.
In addition, when running MAP05 on GZDoom, there's an error that says: "Line 978 has no first side."