Possible bug in "Capture CSAT base" side missions

Whenever we get the capture CSAT base/bunker, the CSAT always respawn at least 4-5 times from within the bunker killing everyone who “captured” it.

Is this an intended thing? It is very confusing and discouraging to get steamrolled by enemies spawning on you repeatedly while not knowing if you have completed the side mission or not.

I got clarification from VileAce, apparently they will keep spawning until we kill ~60 of them.