I'm not sure how else to label this; I don't think this is NES consistent behavior, and it's definitely kinda sucky. I was doing this in proposed1st.qst, just to be clear.
Basically, hitting them with the sword and then turning around very frequently triggers that "flip" behavior that I think is technically possible on NES but nowhere near as easy or common as on the latest versions of Zelda Classic, and Pols Voice don't respond to it all that well with their hopping movement pattern, basically forcing the player to take hits in a depressingly large number of circumstances. The flipping being a bit too easy to trigger applies to all enemy types that suffer knockback from the sword as far as I can tell, but it's only really obnoxious on Pols Voice who frequently basically warp inside you.
I suspect this being a newfound issue has to do with the fix to the Darknut shield bypass bug, and I guess it's not the end of the world since that Darknut shield bypass bug being gone (well, mostly gone... more like much harder to do though still easier than on NES) is way more beneficial to gameplay than this is detrimental. I just thought it was worth bringing up.