This bug report is still under assessment. Unfortunately I do not have a timeframe of when a fix will be made available. You can find out what fixes have been implemented into an engine version in the Announcement and Releases section of the forums, where we post release notes and hotfix updated.
I wanted to point out that using the “Revert Instance Changes to Blueprint Default” option will revert any changes that are shown in the blueprint’s Class Defaults tab. I am currently investigating if this should apply to changes made to a blueprint instance’s components as well.