about a minute after creating a new world and going into the nether, the game crashed very suddenly. looking through the log file it looks like haema was trying to make a mob from the doom mod an effective source (of blood?) and it failed for some reason.
crash-2023-07-19_12.06.20-server.txt
i will notify the developers of MCDOOM as well.

Edit: i forgot to mention, i was unable to recreate the issue by either reloading the world i was in or creating a new one.
Edti 2: MCDOOM 1.16.5 is no longer supported so I can't do anything with them.