Hi
Thanks for submitting the FB.
Confirm here.
Some kind of workaround fixed that for me:
Via Project-Navigator select a source file and via the option-command-2-inspector-pane enable 'show history inspector'-pane. Once you see the commit info for this specific file, you can switch with command-2 to the source control navigator. Now every commit in the repo-history should be shown as before. This procedure did the trick for me.
Up to now looks quite persistent (after quitting Xcode, reboot, relogin, etc.) everything is fine.
update
playing around with enabling code-review in editor seems also work and switching on the repo-commit-history list. have to correct: not really persistent fix. looks like it disappeared again. Oh, what a mess with Xcode B3.
(Hope you) Have fun!