movefile creates directory instead of moving file - no wildcards involved

Using R2020a on Windows 10 64-bit, I've started encountering a problem where using movefile function to rename a file creates the target file as a directory instead of as a file and then fails. There are no wildcards involved, just two explicitly named filenames. The files are text files on a remote shared folder.

[status, msg] =movefile(myjobfile, myfinaljobfile);

where the values of the parameters in this case are:

myjobfile =
    '\\myremotepc\Communications\NearlyCompletedUSIWorker-R5099293-20200916112530284.txt'
myfinaljobfile =
    '\\myremotepc\Communications\CompletedUSIWorker-R5099293-20200916112530284.txt'

And here's the output of movefile in the case above:

status =
  logical
   0

msg =
    'The system cannot find the file specified.'

After the execution (and erroring out) of the code line above, in the Communications folder is now a new subfolder named CompletedUSIWorker-R5099293-20200916112530284.txt and the original "NearlyCompleted..." one is still present.

Name                                                       Size Type                                   Modified  Attr

CompletedUSIWorker-R5099293-20200916112530284.txt               File Folder                      Today 11:28 AM -----
NearlyCompletedUSIWorker-R5099293-20200916112530284.txt 22.3 KB Notepad++ Document               Today 11:28 AM -a---

Some other details:

• The very same code is running on an also-remote Windows 7 system and does not encounter this problem.
• The PC hosting the shared folder is Windows 7.

Is this a MATLAB R2020a bug on Windows 10?