"Save Draft" is no longer an option once a page has been published. Published pages can either be previewed or updated. Currently, if you update a MetaBox on a published page and click "Preview" the changes do not appear in the preview.
If you’re editing a published page and then click Preview then you can’t see the meta values unless you set “autosave” true for the meta box.
The thing here is WordPress auto saves post title and post content so you can preview them while edit (there must be a “save” action so you actually see the changes) and by default, Meta Box turns the autosave = off so you don’t see it. Setting “autosave” true fixes the problem.
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