Shooting through enemies

I recently picked up hg.wad and have been working on UV-Max times for it. I've noticed that my SSG shots pass through certain enemies in this with startling frequency, mostly mancubi, but in certain cases revenants and pinky demons also. The included demo shows me shooting through the same pinky demon twice in a row with the SSG. I'm aware that being too close to enemies can cause you to shoot through them, but in this case I'm not touching the pinky's hitbox. Anyone have any idea what's going on here?

I'm using PrBoom+ 2.5.1.4 on -complevel 9.

wtf.zip

This is the BLOCKMAP bug. It can actually happen at all ranges, it's just far easier to happen at close range.

Ah, right. I looked at the map in doombuilder and that particular area is right between two blockmaps. Irritating. Oh well, thanks for the link, I didn't know about that bug before.

Try not to shoot directly north/south/west/east, it helps a lot.