Bug Report ID: #3395131179 -> Mobs under floor -> abyss remain open

Description:
4 Abysses remain open while the map is visually cleared of monsters.
The map UI still reports 7 remaining monsters, but no enemies can be found.

Observed Behavior:
No monsters are present or interactable on the map.
Abysses do not close and remain active indefinitely.

Possible Cause:
Likely related to serpent-type female monsters that use an underground / submerge / teleport ability.
These monsters may remain in an invalid or unreachable state below the ground.
A similar issue has been observed with another mage-type monster using disappearance mechanics.

Expected Behavior:
Abysses should close once all monsters are no longer interactable.

Evidence: