For me it started on Xcode Version 11.5 (11E608c).
I have not been able to see the branches.
The message when i try on the local machine that runs the bot server is:
The Server SSH fingerprint failed to verify.
I click on the View button i decide to trust to verify the identity of the repository and its repeats like a nice cycle.
When i try on a host machine that executes the bot, it doesn't displays any error, but does not work at all.