It has been months since this started happening in TS3 Client. Basically, the password immunity/ignore permission for channel groups still brings up a dialog box for users trying to connect the channel and asks them to enter a password. They can enter even if they leave it blank but thats not the whole point of the permission. It used to be simple before. People with this permission could connect without the “Enter Password” prompt popping up.
Moreover, the permission works as intended for server groups. The prompt only pops up for channel group permission (which is b_channel_join_ignore_password)