In #2949815: Flagging translations as outdated in a pending revision causes multiple translations to be marked as affected → we have hidden the "Flag as outdated" functionality for moderated content due to how late this issue was discovered in the 8.5 development cycle, however the widget is not added to the form in this case, which makes restoring the "Flag as outdated" functionality for moderated content in contrib/custom modules harder.
Always add the widget to the form, use #access keys to hide it.
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Postponed: needs info
10.1 ✨
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Appears to be a duplicate of #2950626: Allow flagging translations as outdated when content is moderated → could someone confirm.
Looking at #14 again and believe this is a duplicate so will close out. If I'm wrong please reopen.