Odd quirk in folder_format display

[Chris Green]

I have quite a few levels of directories below my ~/mail directory.

For some reason when I navigate through some of them the numbers of
messages are displayed whereas in others they aren't.

Here is my Ju (junk) folder as displayed in mutt:-

-- Mutt: Directory [Ju], File mask: !^\.[^.]
->   ../
     canals/
     digikam/
     dokuwiki/
     leafnode/
     postponed/
     rsync/
     xfce/


... and here is my In (inboxes) folder:-

-- Mutt: Directory [In], File mask: !^\.[^.]
->   ../
     cl/                                19    0
     default/                           85    2
     freegle/                            4    0
     inbox/                             30    0
     odin/                               3    0
     tinnews/                            0    0



... and here are (some of) their contents:-

chris at esprimo$ cd ~/mail/In
/home/chris/mail/In
chris at esprimo$ ls -l
total 24
drwx------ 5 chris chris 4096 Feb 26 18:10 cl
drwx------ 5 chris chris 4096 Sep 25  2020 default
drwx------ 5 chris chris 4096 Feb 19 13:53 freegle
drwx------ 5 chris chris 4096 Sep 25  2020 inbox
drwx------ 5 chris chris 4096 Sep 25  2020 odin
drwx------ 5 chris chris 4096 Feb 27 00:25 tinnews
chris at esprimo$ ls -l cl
total 12
drwx------ 2 chris chris 4096 Jun 15 09:14 cur
drwx------ 2 chris chris 4096 Jun 21 10:18 new
drwx------ 2 chris chris 4096 Jun 21 05:01 tmp
chris at esprimo$ cd ~/mail/Ju
/home/chris/mail/Ju
chris at esprimo$ ls -l
total 28
drwx------ 5 chris chris 4096 Apr 17 20:38 canals
drwx------ 5 chris chris 4096 Nov 24  2020 digikam
drwx------ 5 chris chris 4096 Nov 18  2020 dokuwiki
drwx------ 5 chris chris 4096 Apr 10 12:03 leafnode
drwx------ 5 chris chris 4096 Jun 21 19:39 postponed
drwx------ 5 chris chris 4096 Nov 18  2020 rsync
drwx------ 5 chris chris 4096 Nov 19  2020 xfce
chris at esprimo$ ls -l canals
total 12
drwx------ 2 chris chris 4096 Jun 21 19:36 cur
drwx------ 2 chris chris 4096 Jun 21 19:36 new
drwx------ 2 chris chris 4096 Jun 21 17:49 tmp




I don't understand why I'm not seeing message counts in the Ju folder.
There are similar 'some work, some don't work' folders elsewhere in my
mail folders.

-- 
Chris Green