Heart Swap was cut, yes. Also, yeah, transfer moves on Magearna-Original are illegal.Speaking of Magearna, I have a question and an unfortunate observation.
Is Heart Swap usable? I know Magearna lost it in its level-up movepool, but the move never got the "this move can't be used" description as far as I know, so is it actually unusable in Sword and Shield, or is it just a transfer move?
Original Magearna looks cool, but it should never be used, for a similar reason shiny Greninja should never be used. Using an original Magearna immediately informs your opponent that it doesn't have any transfer-exclusive moves, notably Heal Bell and Heart Swap (if it's usable).
This post doubles as a bug report for Original Magearna being able to use transfer moves and maaaaybe Heart Swap not being able to be used.