Keepers of the Flame Breach Hive failed to spawn any waves

Just had a map where I full cleared the map prior to starting the wave defense with Ailith, and aside from wave 1, the other 23 waves spawned literally zero monsters, so I just got to sit there for the ~2 mins or so and get a free success.

I believe it may have something to do with the "Area contains Many Totems" modifier. as it seemed like either the Breach monsters were getting caught on them, or somehow Totems were being spawned in place of Breach monsters, and once they took all available spawns no more could spawn?

Came to post a similar bug, I also have the "area contains many totems" map mod, a few waves would spawn several mobs, but most waves spawned nothing and I sat there and had the whole encounter time out.