“ctl_mboxlist -d | ctl_mboxlist -u” makes some fields disappear

[Дилян Палаузов]

Hello,

for turning on improved_mboxlist_sort I turned off cyrus imap,  called
`ctl_mboxlist -d > FILE`, renamed mailboxes.db to mailboxes.db2,
switched in imapd.conf 'improved_mboxlist_sort:1', and called
`ctl_mboxlist -u < FILE`, cf 
https://www.cyrusimap.org/imap/developer/thoughts/improved_mboxlist_sort.html
 .

This created a new mailboxes.db file, which is 2.33 times smaller, that
the original (renamed).

The database format is twoskip.  

Converting both the old and new mailboxes.db to flat with
  $cvt_cyrusdb MAILBOXES.dbX twoskip MM flat
and comparing the results, the old file contains


user.ttt.#addressbooks.MMM	%(A %(ttt lrswipkxtecdan) I a0ab91ff-
6de8-4961-b9cf-646b8037e87a P default T a V 1562330471 F 674 M
1599389319)
 
whereas the new file contains

user.ttt.#addressbooks.MMM	%(A %(ttt lrswipkxtecdan) P default T a
M 1601752550)

The fields:
I a0ab91ff-6de8-4961-b9cf-646b8037e87a 
V 1562330471
F 674

are missing from the new file.

Shall I be worried?

Greetings
  Дилян