When viewing commit cf9c9c2 from this repo in Sourcegit the SHA values are highlighted as a links. When clicking the SHA for "SetUpstream" (the last link in the list) the committer is displayed incorrectly.

When clicking on the commit manually, the committer is shown correctly:

Not sure if this is an actual issue from Sourcegit or some AvaloniaUI issue. But since the author is updated correctly, I think it's not AvaloniaUI.