delirium scarab of delusions seems to prevent mirage maps from dropping

I use the scarab of pandemonium to add a lot of bosses to each map. I used to get around one mirage map average.
Since I started adding delirium scarab of delusions to my maps, I've had no mirage maps drop in a few dozen maps.

Bug Report ID: #1,459,354,904

I also use cartography scarab of corruption.
Normally, mirage-empowered maps used to drop unidentified.
While forcing delirium mods onto maps, I still got some unid maps that dropped from mirage bosses, so I suspect those maps should have been mirage-empoowered maps, but the delirium was preventing them from being mirage-empowered.