[ORD 2021 R2] Unable to reattach reference?

I received a set of files from a client.

I need to repath many of the references. I thought that I could use the MS_RFDIR configuration variable, but that's not working as well as I had hoped. I still have files that are not found, showing red in the reference dialog - including files that are in the same directory.

I assumed that, if I went through the Attachment Settings for these reference files, I should be able to repath them. I've been doing that for decades when reference files were not found automatically. However, when I try to do this, I get a dialog saying "Unable to attach" the file

What is this? Why can I not repath the reference? Is this some saved view thing? Some ORD locked reference thing? What reasons could there be for disallowing the repathing of a reference that I KNOW exists? Is there any reason that a reference in the same directory isn't being picked up by my drawing?

"Just print me a half-dozen sheets" is turning into a nightmare...

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