Writing with an update on this issue.
For me, I'm finding that the photo does come back to lightroom, it does go into the folder from which the original came, and if I was viewing photos by folder all works as expected.
If I was viewing by keyword, the copy does not appear. I can go to the folder in the library and find it. Clicking on the original and the copy, I see in the keyword panel that both have the correct keyword(s) applied, but the changed file still does not appear if I view the photos to which that keyword is applied.
If I unapply and reapply the keyword to the photo, then it does appear when I view the photos by keyword.
Does that help anyone figure things out? It's an ugly workaround so I hope it gets fixed soon.
Thanks,
Jeffrey