I found a new bug that if your commander can start on a canyon you can accidently place him on the canyon causing him to get stuck to the side of the canyon which means he can't move same with being on a rock on the middle of a crater with a bump in it's hard to accidently do it but it still needs to be fixed.
With fully procedural generated planets, it's highly unlikely that the core problem will ever be fixed 100%. There are a number of ways we can check the fix-up code to make sure in most scenarios, he's forced to a "valid" location, but if that valid location is still in the middle of a canyon with no way off... the game won't be able to completely prevent you from choosing a bad spot.