The two installations are not identical however. The stretch machine is a server and the buster machine just has smbclient installed.
It may be that "my" bug is different than the originally reported problem in any case.
David
As an update, I still have this behavior on my stretch machine running
smbclient version 4.5.16+dfsg-1+deb9u2. However, on an installation of
buster running smbclient version 4.9.5+dfsg-5, I do not have the bug.
