It's possible in one of several ways; one, don't target the planet on your approach, it's entirely possible to land on it without it being targeted. Two, sometimes planets can bug out and the DSS won't trigger even though they're selected and in range. It happens rarely, and mostly when there are lots of other players present and the game just kind of wants to kill itself; happened to me at Pallaeni, departure camp on DW launch day. I still don't have that planet scanned to this day since, well, going back to do it hasn't exactly been practical given my current location.
Disabling the DSS won't prevent the scan, so that won't work - all you'll accomplish is performing a level 2 scan instead of a level 3 and will have a bit less info on the planet in question, but it will still be scanned and eventually tagged when you sell the data.
As for tire tracks, physics of their longevity aside, I very much doubt that saving them permanently would do any favors to an already enormous and constantly growing exploration database making the exploration servers want to cry. So I very much doubt they'd be persistent mostly due to technical complexities this would entail - saving tire tracks permanently as planetary features is more complicated and data-intensive than just saving a few lines of text indicating some system info and the name of the commander who first sold the data on it.
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