I think you need to know the circumstances in order to understand this report; I am currently working on a project, in which i use commands to set the Health of an entity to the "generic.max_health" attribute of the same entity using /execute store.

This was working fine, until 20w14a, where it just kills the entity, instead of setting its health to the appropriate amount.

The command i used is as follows:

/execute as <target> store result entity @s Health double 1 run data get entity @s Attributes[\{Name:"generic.max_health"}].Base