PLO8 Surprising flop equity comparison

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I see the AAxx hand suited in hearts with an A-hi draw
I see the 2345 hand suited in clubs with a 5-hi draw
Then i see the 5-hi flush winning in flushes way more often.
something doesn't make sense to me here

and why does the AA4x hand make 0 straights in 10,000 hands -- you are never ever dealt 2,3,5 by river?

-g

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The flop has already been specified: Kh4cTc. This is why the 5 high flush is winning so much more than the heart flush and it is impossible at this point for a 235 to end up on the board.