The image below shows my extra orange hearts, but my health is displayed as gems from the stoneborn texture pack.

Could you work something out, and make it so the extra health shows as coloured gems too.
https://www.curseforge.com/minecraft/texture-packs/stoneborn-dwarven-fantasy-inspired-ui-overhaul
It would be really awesome to see all the different health bar colours as gems.
Love your mod.
Thank you.

The texture pack can change Mantle's heart texture. We cannot add compat with specific packs, that is not feasible.

I can't log into the Curseforge site to message the texture pack author. "Something went wrong" every time I try.
Could you relay the link to this page to them for me?

I do not use that resource pack, me requesting support would not make sense. Better for someone who uses it to request support.