Private User
If you have verified that a Requested Merge does not appear in a Manager's Merge Center under "Requested Merges" when the Category after "Viewing" has been changed to "Managed By Me",
then yes, that is a Bug
I would strongly suggest - while that is the Case, so he can also see it - that you either
tag Mike in this Discussion, explaining the situation and offering to PM him links to one or more Requested merges along with, for each, links to the Manager(s) for whom they are not appearing in their Merge Center
Or just PM Mike with that info
Or open a Ticket giving that info - and hopefully, eventually, it will be assigned to him.
Those of us not Curators cannot look at anyone else's Merge Center, so cannot verify that.
Geni's General Manager, Mike, is, I believe, still its chief programmer. He will be able to look and see if it is the case, provided the merge is not cancelled or completed before he looks.