const BlueprintCallable function in interface not being called

I have an interface which defines the function “GetHealth()”, which I’ve declared as BlueprintCallable.
My character class (C++) implements this, and a blueprint derived from this character class calls the
GetHealth() function. Calling this function from a level blueprint also works perfectly.

However, when I define the function as “GetHealth() const” in the interface and class, the function is never called. I’ve rewired my BP pins correctly, but the implementation of GetHealth() is never called. Do interface functions specifically need exec pins?