Hello Stephen,
not matter that the ticket is quit old the versions you mentioned are
also outdated, I think this is a serious matter that should be looked
into. But I am not the Debian maintainer how packaged that.
Did you ever observed that behavior with future version of rsync?
I checked the debian changelog for rsync. IMHO to many things happend
between this two Debian-intern versions. Many patches, etc. Most of the
changelog entries are useless for outsiders and hard to understand for
someone outside of the rsync world.
If there is no feedback from Samual (the DM for this package) I would
suggest we close the ticket because the versions you mentioned are not
relevant anymore and also no one else reported an issue like this.
Regards,
Christian