REGRESSION: No, this occurs as far back as 4.22.
Duplicating two nested components can result in the duplicates not being visible in the component tree in the blueprint editor until the user compiles.
This seems to only occur if the user selects both components and selects the parent component last.
The duplicate components are not available in the component tree. Compiling the blueprint makes them visible
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-82345 in the post.