[Invalid/WAI] scoreboards of type "health" cannot be used as source in /scoreboard players operation

When using a function like this:

scoreboard objectives add health health
execute store result score @s health run data get entity @s Health

scoreboard players operation temp health = @s health

I get this error:

"scoreboard objective 'Health' is read-only"

However, this usage of the scoreboard is read only, so it is odd that this would be the error I get.