Branch merge option not showing in Git Manager

I have been experimenting with Git Manager before using it in my project and got to the point where I want to merge a branch back into the master.

I expect to see the Merge branch option like this as shown in the Git Manager tutorial.

Instead I get this

Which are the same options as if I had right clicked on the ‘master’ (no option to delete branch etc.). All changes are saved and there are no outstanding commits.

I did previously merge a branch successfully when I first looked at Git Manager some weeks ago so I have seen it work but not this time. Can anyone help with suggestions as to what might be wrong here?

I am on Wappler 3.9.5