@databricksHQ - can we receive a response to this post please?

I'm receiving same - this behaviour is unexpected, and never a consideration when using git via VS Code / command line.

-- edit --

This could be due to the GUI loading diffs in a file at the time of user clicking "create branch". 
However, this behaviour seems odd, and should not be mutually exclusive - that is, one of two things should occur / be implemented, if the user clicks "Create Branch" while a diff is loading: 

1. The diff load process is cancelled, and branch-creation take priority, or, 
2. Both the diff load and branch-creation process are assigned separate processes to execute in parallel

The current process of returning an error message without explanation of what's occurring under the hood - let alone how to resolve - is not acceptable.