COPYUID is returned in an untagged response #2114
However cyrus 3.0.x returns COPYUID in an untagged response, as below:
[23-Aug-2017 11:45:32 +0200]: [EE2A] C: A0017 UID MOVE 59667 "T&APY-r&APY-lt elemek"
This breaks Kolab for example.
Ok, seems not a bug (RFC6851):
Servers implementing UIDPLUS are also advised to send the COPYUID