But this is a problem with the PT, not the OT.
The PT dropped the ball on what was already established.
And it still makes more sense for him to appear as a perfect form of the good man he died as rather than the horrible, rotten kid he used to be.
I think this is what bugs me the most - the fact that Lucas chose to retrofit the OT to fit the PT rather than just simply honour what the OT had established.
In the case of Anakin he was originally supposed to be an older man when he died - hence the choice of the distinguished Mr Shaw. It’s the later decision to have ROTJ Anakin be in his mid-40s that makes the whole thing jarring from whichever perspective. Shaw is/was clearly older than 45, and Anakin reverting to his 23 year old self is even sillier. Lucas should’ve just stuck with the timeline and had Anakin be in his 30s for ROTS. That way he would be at least 55+ in ROTJ and the idea of Shaw being the older (and redeemed) version of the same guy would make perfect sense.