Changing Guardian generic.attackDamage has no effect

Editing the Guardian or Elder Guardian attack damage has no effect on either the laser beam attack or its thorn attack. The laser beam attack is also invisible when attacking the player directly. It is visible, however, when attacking squids or other players.

/summon Guardian ~ ~1 ~ {AttributeModifiers:[{AttributeName:"generic.attackDamage",Name:"generic.attackDamage",Amount:20}]} 

Will test on more versions shortly!