What does a 'Const' BlueprintType mean in the Content Browser?

I was browsing through some Blueprints in the Content Browser and saw some with a BlueprintType of ‘Const’:


I’d like to make my own const data-only BP and I assumed this is what the ‘Const’ UCLASS specifier is for, but when I add this specifier to my UCLASS, my BP still shows up in the Content Browser with a BlueprintType of Normal… is this not what the Const specifier does?

My UCLASS specifiers are:
UCLASS(Const, Blueprintable, BlueprintType)