Thank you so much for this cool tip and explanation. I am also experiencing this bug so glad I now have a way to search for the actual actor in the Outliner that is causing the issue.
For anyone else who needs an additional step to this advice, not all actors have names. If there is no name for your .uasset file, you can paste the numbers and characters after the / and before .uasset
Example - here’s one of my errors LogValkyrieValidation: Display: Found disallowed objects for asset Content/__ExternalActors__/Capture_The_Flag/8/XJ/O3IDILUT35VK4E6RI2V2T2.uasset
In this case you would just copy the O3IDILUT35VK4E6RI2V2T2 and paste this into the Outliner. Hope that helps!
Looking forward to a fix for this bug soon but thanks again.