Bug#972079: cyrus-imapd: Seen/Unseen Flag not working correctly if sharedseen of a shared mailbox is not set to true

[Yadd]

Hi,

to help us to resolve this issue, could you take a look at this comment?
https://github.com/cyrusimap/cyrus-imapd/issues/3240#issuecomment-877913241

Cheers,
Yadd