[1.2.1] Map generation bug(?) leads to missing portal boss

[Frumple]

As per title. Finally caught the ruddy game in cheating me out of a farpotral boss. Entered level, boss was nowhere in sight -- apparently generated in a disconnected room. Several turns later, it apparently managed to get itself suffocated to death, leaving me down 45 fortress energy with nothing worth mentioning to show for it. It would be incredibly nice if this didn't happen.

This file (hosted at upl.co, should be ~4.7 megs) has the entire save folder shoved in it, since I wasn't entirely sure which bits were needed, as well as a truncated log file (everything from the start of that last level until I saved) and the web log, whatever that does. Also attaching the included log file, just as a backup.