Chat URL changes after restart

[reedah]

On a self-hosted system, the URL of the chat server is changed after restarting in the Windows app version 4.3.0 (same problem in earlier versions) and this results in a 404 error. For example, if the URL is https://chat.example.com/ that gets changed to https://chat.example.com/(^+1)
There appears to be no way to change it back other than deleting and re-adding the server.