Could you post the current coordinates of the site, for the benefit of all who are willing to go there (yes I know, FSS/DSS will show the place, but anyway), please?FWIW, I just flew to HIP 12099 with an alt that has never been there. I flew to body 1b, surfaced scanned it and got some POIs on it, among others one for Jameson crash site.
This seems to indicate that it's not a general problem, maybe worth talking to support to check your game save data. Maybe something's gone wrong with your save.
Don't think I'll try to go back to verify that it still shows in the future too, but since I've landed I'm gonna do the site once and then go do something else.