Problem with post revisions after updating to 2.8.6 stable or 2.9.0.beta7

This should be fixed by FIX: Allow Time objects to be deserialized in PostRevision (#17501) · discourse/discourse@7d9b98a · GitHub

and on the stable branch FIX: Allow Time objects to be deserialized in PostRevision (stable) (… · discourse/discourse@5d2ecce · GitHub

To update a standard install, visit /admin/upgrade

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