PST Import all mails marked as read

When i import a pst File with kopano-migration-pst all e-mails a marked als read and i lost all unread information. Is this a known bug, or a configuration issue?
i used the following command

kopano-migration-pst backup.pst -u jdoe

I think this is not related to KOE, as in WebApp the mails are probably marked as read as well, right?
I am going to move your thread to the Core subforum.

Yes, mails are also in the WebApp marked as read.