When i execute a command like :
/attribute @p minecraft:generic.max_health base set 8
Command works but when player take heal or instant damage, there is a visual death bug.
It happen 100% of the time when the following condition are done :
Player have all of he's base max health (20.0f)
Run /attribute @p minecraft:generic.max_health base set 8
Use /effect that change player amount heal points, use a potion that change player amount heal points, will cause the death bug
If the player don't have all of this base max health but something like 15.0f there is a little bug that decreasse health and up it (in 0.5 sec) at the max amount setted but no death bug.
Duplicate of MC-19690.