This happens sometimes, from what I understand. The site is still there though.
Move to one of the nearby fleet carriers, your short range sensors will scan the planet again and it should show up.
Well, if re-logging doesn't make it appear, you can always fly to the coordinates manually.
-54.3, -50.3
look at ship hud whilst in orbit ground co ords will show
no once visited it is seen in poi if i rem correctly
It's there
View attachment 388824
Maybe this is the game trying to hint that a life of relog-grinding in graveyards for mats is not for you?