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I noticed that when I rename server/channel groups on the TeamSpeak server or change the icon of the group via the TeamSpeak 3 client, this is not applied in the TeamSpeak 5 client until I reconnect. However, changes to single permissions of the groups are already applied.
I also noticed that there is a very large space between individual server groups in the permissions list when changing them via TeamSpeak 3.
Additionally, one server group was duplicated after I renamed it via TeamSpeak 3. One group has the old name, the other has the new name.
My server version is up to date.