TheBear69, I'm not sure that the ambiguity of one of the abbreviated obstacles is an oversight at all, but a deliberate red herring, especially as the other abbreviation also occurs twice, this time not resolved by a cell count. That ambiguity certainly delayed my insight into the theme.
There's something about the depiction that strikes me as not quite right so I need to check my grid carefully.
I thought the clue surfaces were excellent, and, as already noted, the unwanted characters very neatly inserted.