Why is the Implemented Interfaces option not visible in Class Settings?

I created a Blueprint Interface called BPI_AddScore and I would like to implement the interface in BP_PlayerController. However, the Implemented Interfaces menu does not have the Add dropdown menu.

Why is this option disabled?

Screenshot of BPI_AddScore:

Screenshot of BP_PlayerController:

Evidently this is a known interface bug with UE 5.1.

Naming for Inherited Interfaces and Implemented Interfaces is reversed in 5.1 and Main. Inherited interfaces act like implemented interfaces, and inherited interfaces appear listed under Implemented interfaces.

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I don’t understand, what is the solution to fix the issue ?

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