Are there still issues with scanning on planets?

I did bookmark a planet a while ago that, at the time, had arsenic on its surface. I just got back to it and I've been driving my SRV for over 10km and didn't get a single blip on my scanner. How is that possible?
 
Using the Scarab. I think they changed things since I last played. I picked up another planet that was listing a bunch of resources and there, I got some stuff. It seems you will find resources only if they are listed in the system map.
 
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