Alright, sorry to keep blowing up the thread, but i spent last night troubleshooting and in GZDOOM 4.5 there's no issue. As soon as I switch to 4.6, 4.61, or 4.7.1 I get invisible chaingunners but only with the Neural upscale sprites.
I can confirm this on my system, and in fact all Doom 2 sprites (monsters, archvile fire, super shotgun pickup etc) are invisible. I am baffled as to what would have changed in GZDoom 4.6 to have caused this. I'll investigate.
