Two processes open edits A then B on one app; the server drops A when B is created, so process 1's later read of A gets HTTP 400 'This Edit has been deleted' while process 2's read of B returns 200.
Android

Google Play’s edits.insert silently deletes the app’s previous open edit — two parallel API scripts fail with ‘This Edit has been deleted’

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Two Play API clients on one app: the second edits.insert discards the first edit and every call on it returns HTTP 400. Serialize per package.