This also seems to be affecting retail builds the same way. We just rolled out updates to 2206 15330.20230 and the problem exists there as well. The difference here is that I cannot seem to find a way to roll back the update or install to an older version. I have tried some of the suggestions with building an XML configuration file with the build I want to download, but it has not worked. It started up the day I left town on vacation (07/12/2022). I got off the plane and had at least a half dozen messages with people having this message pop up. I would love a solution to get an older version installed. Sadly, there is no rollback feature for Office Updates via the retail channel.
I can confirm that if I map to a drive letter, the issue completely disappears. It is only for anything that is hitting a UNC path.