depot_tools maintainer here. I haven't seen such reports in our bug queue.
What Gerrit is reporting / seeing is correct: there is no code difference between 9e635356 (PS4) and 220b3b3c (PS5) (
empty diff). PS6 (640a8a86c) has the patch. So, something happened during git cl upload that resulted in sending the same patch. If you still have the entire terminal history (PS4, PS5 and PS6 uploads), that could be useful in order to debug what actually happened. And, of course, if you have repro steps, that would help a lot. Please file a bug under
infra>sdk so we can take a closer look.