The action fires after the Save Draft (or Save as Pending) and Preview (or Preview Changes) buttons in the Publish meta box.
The previous description stated that the action fires before the post date/time setting, which was not quite correct, as there are also post status and visibility settings between the action and the date/time setting.
Follow-up to [34895].
Props bedas, audrasjb.
Fixes#54045.
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