I can no longer reproduce the problem. Sorry for the long delay. I have a really busy time these days. Mount seems to work seemlessly on USB drives. Thanks, whoever fixed it.
On Tue, 2022-01-18 at 19:36 +0000, Debian Bug Tracking System wrote: > This is an automatic notification regarding your Bug report > which was filed against the systemd package: > > #1002805: systemd: Upon mount, immediately umounts external drives > not connected at boot > > It has been closed by Michael Biebl <em...@michaelbiebl.de>. > > Their explanation is attached below along with your original report. > If this explanation is unsatisfactory and you have not received a > better one in a separate message then please contact Michael Biebl > <em...@michaelbiebl.de> by > replying to this email. > >