Hearts not regenerating after losing hearts closing and reopening sorld puts hearts back to full

Same problem here. The Broken Heart item saved me from death, but took away heart containers. Sleeping did not restore them, but reloading the world did indeed bring them back.

I think I also experience some weirdness on a testWorld with SoLCarrot/SoLPotato, where SoL-gained heart don't seems to regen.
I simply don't use Broken Heart in my regular play, as modInteraction seems weird at best, game breaking at worse.

My hearts are not regenerating after sleep, only on death.

I do have Quark installed using the Improved Sleeping, not sure if is related.

Logging out and logging in again solves it

Having a similar issue. Lost hearts don't regenerate after sleep, they appear to do so, but don't function or regen at all. Reloading the world or restarting minecraft removes all bugged hearts but health is still reduced from 20. Dying makes the reduced health permanent, so when you sleep you can no longer regain lost hearts. maybe a quark error? or the item could just be broken. Has made me delete some long time worlds.