Unwanted Stalker in Base Alien Containment

LeighamLock

I hatched Stalker eggs in an Alien containment unit and then released them just outside my base. They proceeded to hang around base and play with the scanner room cameras. Not a big deal and even slightly amusing. However, they apparently won't leave the area where they were released and have attracted some friends. For some reason, one or more Stalkers will occasionally appear trapped inside my base. One has even invaded a newly built alien containment unit. Seems like a bug to me. Anyway, is there a way for me to remove a stalker (or any fauna) that doesn't belong in my base?

_cthulhu_

That happens to my Jelly and Rabbit Rays.
I wonder if they just miss the containment?

AnomalyDetected

Releasing them sets the place for them to stay at that location. This is on you. You should have placed it farther away.

Use a stasis rifle and kill it. It will fall through the collision a little bit after.