When the player dies with the health boost effect active, the extra hearts continue to display. The extra hearts are not functional and the player does not retain the health boost effect (regeneration does not heal the player further). The visual bug remains even after subsequent deaths and going into creative mode and returning to survival/adventure mode.
Linked issues
Comments 3
Thank you for your report!
We're actually already tracking this issue in MC-108707, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
Quick Links:
📓 Issue Guidelines – 💬 Community Support – 📧 Customer Support – 📖 Game Wiki
Solutions for the visual bug:
-Re-logging into the world
-giving the player health boost then removing the health boost effect