I already mentioned this previously, specifically wondering why this wasn't addressed concurrently with the Watchman bug.
I'm running through my third campaign save and just randomly fast-travelled across the map to capture these screenshots.
Basically, once you enter Caimanes and your campaign recognizes the mission (Archangel) -- independent of ever fast-travelling to Caimanes Echo to prime it, you incessantly receive the checkpoint notification on every subsequent spawn or fast-travel until such time as you task yourself with it.
https://imgur.com/a/M9YwB5f
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Ah, the joy of having turned off the HUD. Didn't know what I was missing ... 😎
Thanks for making us aware of this, also appreciate the screenshots to go with it for more visibility on the bug.