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Found 2 areas where you can go out of bounds and 1 where you can see out of bounds in HI.
first spot (cant get through but can see through):

Approximate map location (marked with my player icon):

second and third spots: (can fit into leading to only escape being warping to a way shrine):


the last one is huge. I fell in to check it out but once your in you cant get out except for the /unstuck or way shrine.
pic of me in the hole for a bit of fun:

haven't seen this covered yet so I made a forum account just to report them.