[1,760,430,619] Rare enemy spawned in unreachable area in Necropolis map.

Same enemy type has been observed to be able to approach player from outside walkable zone.
These instances of enemies however seem to be unable to fly out of the enclosure.
The enemies are unreachable by skills that bypass elevation such as Orb of Lightning.
Map is unable to be completed due to one of the enemies is the required rare enemy.
Only 2 enemies can be seen moving around in the enclosure, both are normal enemies with "Minion" mod, the rare enemy can not be found.