[MC-179945] An increased max health attribute causes ghost hearts to appear after death

The bug

After attributing yourself with a higher max health then dying the previous row added becomes ghost hearts not regenerating or giving extra hearts.

How to reproduce

Make sure your health/hunger bars are full
Run these commands in order while in survival mode:
```
/attribute @s minecraft:generic.max_health base set 40
/attribute @s minecraft:generic.max_health base get
```
✔ notice the result is 40, and the health bar has doubled and will slowly regenerate a bit

Now run these commands:
```
/kill @s
/attribute @s minecraft:generic.max_health base get
```
❌ notice how it now says 20 and the hearts in the top row are now empty and refuse to regenerate

Linked issues

relates to

MC-179863 Setting attribute minecraft:generic.max_health value to 0 or lower causes an infinite death loop after dying

MC-179940 Player's attributes reset back to default values upon respawning

Attachments

Comments

Avoma 2020-12-19T15:12:09Z

I am unable to reproduce this issue in 20w51a.

Avoma 2021-02-15T11:23:23Z

Also unable to reproduce in 21w06a.

violine1101 2021-02-15T13:12:04Z

Could you please provide steps to reproduce, as well as the exact commands used?

Jack McKalling 2021-02-15T15:30:49Z

I was only able to reproduce the "ghost" hearts that don't regenerate, in this very 20w17a snapshot. In any newer version of the game, even 1.16.5 and 21w06a, these hearts don't show but your health is still reduced back to 20.

Jack McKalling 2021-02-15T19:49:42Z

The problem with the attibute resetting after death, is already tracked by MC-179940.
The ghost hearts have indeed been fixed, probably along with or due to the fix for MC-179863.