AutoDoom r5712 infinite loop until OOM on ouroboros stairbuilders

Is AutoDoom still being worked on? Because I've just found a fatal bug in the way it handles ouroboros stairbuilders, namely that it doesn't seem to handle them at all, and instead freezes while consuming increasing amounts of RAM until it runs out of memory and either quits with a Z_Realloc error or is killed by the OS (it seems random which one happens first).

I actually first encountered this bug a while ago when a map I was working on was reliably blowing up AutoDoom, but I only just got around to investigating the cause and narrowed it down to one particular staircase. EV_BuildStairs() handles such cases implicitly by aborting if the next sector is already engaged in an action (including the stairbuilding action itself), but as far as I can tell the bot doesn't check for this at all when routing the map and just goes into an infinite loop.

Example map:

stairbug.wad.zip (Doom 2 MAP01)

I'll note this on GitHub.

I've been on a long stint mucking through Eureka, but hopefully I'll be back on AutoDoom, though I'm really considering it deserves better AI by this time, and this is tough shell to break. But fatal bugs are fatal bugs and they need fixing independent on feature development.