You can actually execute a checkout on the expandable category "Branches" in the side menu just like any branches, either by double-clicking or with a Right-click. This result obviously in an error:
"
git -c diff.mnemonicprefix=false -c core.quotepath=false checkout Branches
error: pathspec 'Branches' did not match any file(s) known to git.

Completed with errors, see above.
"
This is not major issue but I have a tendency to trigger it regularly under normal use.