move more than one subvolder doesn't works

[Arno Schneider]

Our setup:

2 replicated dovecot 2.2.33.2 servers
   thunderbird client

When I select more than one mail subfolder in thunderbird and drag & 
drop them to another subfolder only one subfolger is moved. In the 
following I can't move another mail folder to the first target.

Any ideas why this happens?

best regards, arno

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