Encountering an issue when I use the "generic.maxHealth" attribute with an item in the Mainhand slot. When I add a negative value to subtract max health from a player holding it, nothing happens. I have tried doing a flat amount alongside a percentage amount (-2 for flat, -0.2 for percentage) but the issue still persists. I have also tried modifying the attribute slot to offhand and all but no success there.

I have tried modifying the UUID to see if there was any conflict with another item, but it seems that's not the case.

If anybody would like to see the command just in case, here it is;

/give @p slime_ball{display:{Name:'

{"text":"item","color":"green","bold":true,"italic":false}

',Lore:['

{"text":"loreline"}

']},AttributeModifiers:[

{AttributeName:"generic.max_health",Name:"generic.max_health",Amount:-.2,Operation:1,UUID:[I;1812067452,-185448233,-2039145829,-575693722]}

]} 1