Adding and Interface to Blueprint that already implements a function of the Interface, fails silently and doesn't add the Interface.

Development Programming & Scripting UI
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1

Expected: Should log an error to the BP Compiler Results or (preferably) tag/convert the existing function as being an implementation of the interface and successfully add the Interface. This falls under the general ‘hard to refactor Blueprint’ topic.

2

I’m having the same problem.
I’m adding a function to an already implemented blueprint.
The function does not appear in the blueprints implementing the interface.
I’ve tried removing and adding the interface, and only the function appear.
(4.20.1)