It's very common, I'm afraid, and Frontier made the mistake of having these appear everywhere, even in the remotest systems on the other side of the galaxy, completely killing the immersion (there's a small chance you'll randomly land on a previously visited planet on the other side of the galaxy and encounter a wreck, but have these spawn on literally *every* planet in the game is beyond silly). Apparently they'll clean it up with 2.1.
The chances of encountering something like this should drop exponentially the further away from the bubble you travel, to the point of being beyond jackpot lottery chances when beyond 10kly or so. The funny thing is they already did this with salvageable wrecks (won't find any past 10kly) and some surface POI types (you won't find randomly generated bases past a few thousand ly from the bubble).
So they actually thought that every planet in the game being littered with crap thereby completely killing the explorer's feeling of being the first human being to ever land there was a good idea. Anyway, they're fixing it, apparently. As always with Frontier, something simple that should have been in from the start requires big announcements and months of work (galaxy map bookmarks, anyone? Big announcement how it's coming? Why not make a paid expansion just for that while they're at it?)
Anyway, went off on a bit of a ramble, sorry about that. ATM it's pretty common, hopefully this will indeed get fixed with 2.1.