For what little it's worth I can read the rules either way and see both sides of the argument. When I look at 'the Vogel loop', and  'Fire Golem infinite burning' issues talked about on the second page of the thread I move to the rule forum rules assumption;  "Where there are several ways to interpret the rules; the one that doesn't break the rest of the game will be right." Which brings me down on the side of 'you check once and don't go back to check again', IE you un-bury and don't