Yup, I've done that, several times in fact. These Regeneratable POIs can be re-looted after they regenerate. As an Update on the UCH H. - I went back after I fixed my gameoptions.yaml file and it does NOT now regenerate, although the core is still gone, so it must not have reached it's "regenerate time". I meant to try placing a core but forgot to try that. Next time I'm on the planet, but it might be a while, I'm back to doing the Storyline. Other POI's are now allowing core placement so I'm happy about that. <- See?