[git] After publishing a new (empty) branch the "Recent Activity" section shows only the first commits (BB-7168)

As in title, with a git repository, after publishing an empty new branch—I used the github client—in the "Recent Activity" section I get the first commits instead of the last ones.

After pushing some other commits I get the new ones just pushed and right after the first ones.

The commit history in the "Commits" panel is fine and the history seems right.