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The filesystem backend did not serialize a generation field when none was set. The maintainer fixed it in PR #812 so the fake server always returns a generation number (based on the current time), matching the real GCS API, and the reporter confirmed uploads now work with the PHP client. Upgrade fake-gcs-server to a build containing the #812 fix and update the Docker image.
Source: https://github.com/fsouza/fake-gcs-server/issues/701