Bug#1129956: openssh-server: Cant login with UsePAM no since upgrade to systemd 260rc2

Package: openssh-server
Version: 1:10.2p1-5
Followup-For: Bug #1129956

Dear Maintainer,

I forgot to mention that both my main machine and my laptop are running Debian sid from long time ago, being regularly full-upgrade-d (main machine > 10 years, laptop since > 5 years).
I vaguely remember at some point the password hashing algo for /etc/shadow was changed.
I wonder maybe my /etc/shadow uses the old password hash (for the root and user accounts I test) which may not be supported in the newer ssh/login/whatever service? 
And could this be the reason it does not reproduce with brand pristine install of debian testing upgraded to sid..?

Just a thought
manul