Some side ops not darkening [duplicate]

I have a few side ops on my list that are still bright despite being checked off as completed. Most seem to get darker as you finish them.

The only one that comes to mind at the moment though is one of the prisoner extractions (prisoner extraction 3 maybe?). It still shows up on the map as well (even if not highlighted in the list) and I can still go to that location while in free roam, trigger it, and complete it again.

My guess was that this was a repeatable side op. It just seemed weird that only prisoner extraction 3 is so far, and not 1 or 2. Can anyone confirm/deny this?

Edit: Looks like a similar (if not duplicate, yet differently phrased question was already asked here. Good, additional information on the accepted answer over there as well.

Solution 1:

There doesn't seem to be any true consensus on the topic from a number of discussions including here and here.

However, since players are able to complete all 157 side-ops even with these reappearing ones, it strongly favors the fact that these are simply replayable and the ones chosen for replay-ability don't follow expected numerical patterns.

Perhaps the ones chosen have some other values to them like materials/animals that you can also gather.

Solution 2:

The way it works is the map is divided into areas and each side-op is in a certain area. You can't have more than one side-op active (playable) in the same area.

The game will prioritise the yellow side-ops highest, then uncompleted ones and lastly completed ones.

So if you have no uncompleted side-ops in that area, it will just put up one of the completed ones so there's always side-ops available to play.