This was tested with Gzdoom 4.7.1.0 with default compability, but it also happens with Boom(strict) option.
Sign of Torment uses much more Boom features, than other wads and this is the main cause of most of the bugs.
Link: https://www.moddb.com/mods/sign-of-torm ... le-megawad
Projectiles like fireballs and plasma projectiles are not visible in all white areas in Gzdoom.
This is a minor thing. Map 17 has area like that at the beginning. Although you need to idfa to get plasma gun.
White colormap in Ep2 underwater areas doesn't work in Gzdoom (hardware renderer).
It's self-explanatory. Red keycard area in Map 15 (sector with tag 7) uses white colormap and is the closest to the player start.
Some switches(linedef 210) have no sound in Gzdoom.
This is rather a human error, than bug. Basically some sourceports removed sound made by teleport switches. I understand this change,
but the problem is that the change is also carried over to SILENT versions of these switches. Linedefs 210 aren't used in mapping like normal versions.
I also understand, that linedefs 210 are extremely rare. I only know two other wads that have them and this issue also happens there.
I've found use for them and they appear often after Map 15.
I want to make myself clear, I do not talk about linedef 195 (SR Teleport). This problem is about linedef 210 (SR Teleport Silent) only and this is an implementation issue.
Maps 16 and 21 have linedefs 210 right at the beginning. I strongly suggest to launch these maps to understand, what I mean.
100% secrets in Maps 22, 27 are impossible in Gzdoom.
This one is difficult to explain. The two maps use change effect to change non secret sectors to secret ones. It's still impossible to go over 100%, unless with idclip.
In Map 22 linedef with tag 23 causes to teleport SSG and changes sector to secret.
In Map 27 linedef with tag 129 changes sector with tag 130 to secret one. (This one is also closer to the beginning)
Translucent flats don't work properly in Gzdoom (hardware renderer).
There is really nothing to say about it. It's been known for ages. Map 27 uses this in one area (sectors with tags 19).
I grabbed the idea from here: https://www.doomworld.com/forum/topic/1 ... s-in-boom/