[MC-124662] Attribute Modifier generic.attackSpeed isn't working correctly

The Attribute generic.attackSpeed will not work. If I e.g. give myself one with an Amount of 1.6 (which should be exactly as fast as a default sword), you can spam-click it, the value does not seem to change anything.

Here are the commands used:

1.12.2

/give @s minecraft:diamond_sword 1 0 {AttributeModifiers:[{AttributeName:"generic.attackSpeed",Name:"generic.attackSpeed",Amount:1.6,Operation:0,UUIDLeast:886938,UUIDMost:310468,Slot:"mainhand"}]}

1.13+

/give @s minecraft:diamond_sword{AttributeModifiers:[{AttributeName:"generic.attackSpeed",Name:"generic.attackSpeed",Amount:1.6,Operation:0,UUIDLeast:886938,UUIDMost:310468,Slot:"mainhand"}]}