The hardcore-signifying markings on absorption hearts in Hardcore mode are extremely light, and almost impossible to notice without really looking hard. they also appear to be asymmetric, as the marking only appears on the left half.
A fixed icons.png that makes the markings more akin to usual hearts is attached. (Although I'd really suggest just splitting up icons.png into its constituent sprites instead.)
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I can confirm for 1.16.4 (though this might be a feature request)

As for the hearts not centering, I think thats normal, I don't think hearts have ever been entered in normal gameplay and I believe that hotter icons on the left side of your screen will always start at the left and vice versa.

What do you mean by hearts not entering?

*centering

This is related to MC-18880.

I think it should stay true to the original design of one "wing" on the left only, but that's up to Mojang.
Can confirm in 21w05b.
Can confirm in 21w06a.

Confirmed for 21w42a.

Affects 1.18.1

can confirm in 1.20.6

Can confirm for 1.21.3