Dreamweaver 21.3 15593: page names/file names in HTML are changed to 8-digit alphanumeric code
I am finding hundreds of broken links in my very large site: Page filenames and image filenames are replaced by 3-character alphanumeric codes, as shown below. Pagenames are more often involved, but image filenames are occasionally broken in the same way.

This is a new-ish behavior. I have seen a few in the past, but I am now finding hundreds of broken links.
The site is stored on a OneDrive drive, although this has been the case for longer than I have been seeing the file names changing -- I think. I cannot think of any other environmental issues to identify: It appears to happen both to Windows and Mac computers; I am running Windows 10.
