Horizons Tip off-locations aren't permanent?

A couple of weeks ago I received a tip-off for a crashed ship. I went there, found an Anaconda with some canisters and an unknown artifact next to it and a datapoint to scan. Later on I regretted not making some nice screenshots and decided to go back, I still had the message with the coordinates. So I flew back there only to find the site empty, everything was gone. Which strikes me as weird because I've seen screenshots from other players showing the same wreck at the same site and same coordinates.

So my question is, are tip-off POIs removed after some time?
 
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