[BUG] Infinite Drill Site Spawning

[Slim-Pickems]

Round ID:3054

Testmerges:

#3976
#4013
#3973
#3952
#3702
#3733
#3980

Reproduction:

Let drill site empty out of available cores.
Unwrench and pull away the drill.
Come back to the drill site and see the horde.
Watch as multiple distress calls pop up from the original ship and its would be rescuers as the enemies do not stop coming.

Red circle is to show where multiple enemies were spawning around.

[firebudgy]

Hey this happened the other day too and has reportedly happened numerous times before this, this isn't a one-off