"Edit Bot..." button disabled after upgrading Xcode

I've updated my Xcode from 9.2 to 9.3 (It seems to be an issue with later versions as well) and now I'm not able to edit the bots anymore.

What I tried:

• I installed the additional components on the server and local machine that you will be prompted about on first open after updating Xcode.
• I restarted the server and local machine.
• I checked the option "Create and View Bots" on the server. It is set to "logged in users". Just as before the update.
• Everytime I want to open the Xcode Server preference pane in on the local machine in Xcode settings under accounts it gives me an error. When I try it a second time it works though. But it aways fails at the first time:

• I removed the Xcode Server from the accounts pane and added it again.

I solved it by removing and adding the server by IP address:

Then it was possible again to Edit the bot.

Still strange...