When writing the dummy message after all messages were expunged from mbox, the UIDVALIDITY value was set to 0 if X-IMAP/X-IMAPbase header wasn't read. This caused the next parsing to treat the header invalid and didn't recognize it as dummy message.
When writing the dummy message after all messages were expunged from mbox,
the UIDVALIDITY value was set to 0 if X-IMAP/X-IMAPbase header wasn't read.
This caused the next parsing to treat the header invalid and didn't
recognize it as dummy message.

damoxc/dovecot,Distrotech/dovecot,Distrotech/dovecot,LTD-Beget/dovecot,LTD-Beget/dovecot,Distrotech/dovecot,damoxc/dovecot,Distrotech/dovecot,LTD-Beget/dovecot,damoxc/dovecot,LTD-Beget/dovecot,damoxc/dovecot,Distrotech/dovecot,LTD-Beget/dovecot,damoxc/dovecot