Items with attributes e.g. generic.movementSpeed will not work after deselecting and wearing them

do (in commandblock)

/give @p minecraft:golden_boots 1 0 {AttributeModifiers:[{AttributeName:"generic.movementSpeed",Name:"generic.movementSpeed",Amount:0.4,Operation:1,UUIDLeast:894654,UUIDMost:2872}],display:{Name:"Speed Boots",Lore:["Put on for a 40% Speed boost!"]}}

1: take the boots twice (two pairs)
2: put one in your hotbar and donot select it yet!
3: put one on your feet...
4: the screen FOV gets bigger
5: without being in your inventory select the boots in your hotbar...
6: now deselect it again and the FOV goes back to normal
7: this should not happen because you still wear your boots!

(
What I expected to happen:
The FOV would not go back to normal and your speed will still be working

What actually happened:
The FOV gets back to normal and lost your speed.
and in a random amount of time it went back to the bigger FOV and the speed effect came back again
)