This (bsp23bug.wad) is a pwad that exercises what I think to be
two spectacular bugs in BSP 2.3. Recipe :|
1) At the start, look at the red wall in front of you.
2) Outside, near the candle, you can see a red wall that
shouldn't be there, since there is no linedef at that
spot. It's still solid enough to hide the dead marine
behind it. Also, for a psychedelic trip, take a walk
along the long red wall nearby.
I've tested the wad with XDoom, LxDoom and the original Doom. I
think the bugs are in BSP 2.3, not in the wad or in Doom
because, when using Warm to build the nodes, they don't show.