ZDoom

Alright, thank you for your explanation.

1.22 is basically a different engine than what we got now.

Concerning the obituary code, this is just one of the problems with it. The real issue is that there's no tracking system what precisely caused the damage leading to the player's demise. So some guesses need to be taken and in some situations they are just not correct.

A lot must have changed in the obituary system from 1.22 to 2.1.7, as the glitch doesn't seem to occur in 1.22.

Yes, known limitation of the obituary system.

If you fire a BFG ball at other bots/players and then switch to another weapon before the BFG ball detonates, the obituaries will state that you fragged them with your selected weapon, provided that the selected weapon is a hitscan one.