In the calendar automation you can "move all the cards more than x days in list" to another list. You can use that as a way to trigger the action you need and return the cards to their previous list.
Hmm did not work:
1 hours after a card in list "example" is due, post comment "test"
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It is an action under List in Calendar So you pick a trigger like every day at 8pm. , then move the cards out to a trigger list. Have a rule to watch for cards moving into that list, add a comment action and move the card back to its previous list.
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