Error with virtual index "Broken mailbox_count header"

[Tobias Kirchhofer]

Hi, we experience trouble with one of our virtual mailboxes.

dovecot-virtual:

`
*
-INBOX/Trash
-INBOX/Spam
     all
`

Error log:

```Error: virtual index 
/var/vmail/mailboxes/kirchhofer.net/tobias/virtual/all: Broken 
mailbox_count header```

This happens only with the filter form above. All other virtual 
mailboxes works fine.

Jakobus Schürz experienced something similar:

https://www.dovecot.org/list/dovecot/2018-January/110656.html

We do not have the panic message.

Is this probably something on our side or is this Dovecot?


```
namespace virtual {
   prefix = Virtual/
   separator = /
   location = virtual:~/virtual
}


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