I don’t know if that can be called a bug. But I’ll just submit it, even if it’s just a minor matter.
If you look at the server information, you can see how many players are on the server. So if you click on the “bar” at the top. The function to update it is missing here. You have to click on something else and then go back in to update it. In Teamspeak 3 there was an update button here.
I hope I was able to help you just a little bit!