Trying to sync `master` -> `<release branch>` through the GitHub UI fails
- Dominant language
- Dart
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Description
One way to quickly create a PR is to [open a release branch](https://github.com/flutter/flutter/tree/flutter-3.32-candidate.0), and click "... commits behind `master`":

That will generate a PR that has every commit since diverged, like so:
https://github.com/flutter/flutter/pull/166874

Unfortunately it doesn't work as expected, because it thinks this is really the previous commit:
```txt
DetailedApiRequestError(status: 409, message: Document already exists: projects/flutter-dashboard/databases/cocoon/documents/ciStaging/flutter_flutter_2fc716dbeb68abf9675d7f81162b0b90ceb88808_engine)
```
This would be a huge time saving workflow to be able to use, so it's unfortunate it doesn't work.
/cc @jtmcdole @reidbaker
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