Mirage on City square bug

Bug id 3.431.352.711
The mirage area is less than half the screen

from 3.28.0e Patch Notes

"

Mirages will no longer spawn in a particular City Square room that made them unable to spread very far.

It should be fixed, but the problem still exists.
Got this 2 times after the patch.

Only 1 boss of the 3 is spawning but untargetable and not moving but attacking.
My farming strat is bricked and unplayable now.