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.