Non-Human POIs - Persistent or Random?

I'm currently in deep space, heading toward Colonia. While exploring a few atmospheric planets, I was surprised to discover Non-Human POIs on some of the planets.

At first, I thought these might be persistent, so I made note of them so I could refer them to Cannon later. However, the third one I found disappeared after I logged out and then logged in later. So are these persistent, or are they just randomly generated similar to all the Human POIs?
 
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