varibale doesnt set to BP value

Hi there ! I got i kind of a bug here or bug in my brain , Basically i got struct which contains certain data and one of it is this:
UPROPERTY(EditDefaultsOnly)|
FVector MeshSpawnScale = FVector(0.1f, 0.1f, 0.1f);|

So set it to this in BP :
image

but when i try to print it in cpp begin play or other functions it still has a value of (0.1,0.1,0.1) ,Why it is happening i am stuck for 2 hours already ? I am not able to change Scale of SM at all