I shall not point fingers at specific examples because edit histories carry the usernames of members who voted to close a question: but I have seen a few (admittedly rare) instances where a member posted an answer and then voted to close the question, which had not been substantially changed by editing after they posted that answer, until it got closed.
That set me to wondering: questions are put on hold to prevent them being answered while OP edits to sort out some fundamental fault in the Q; so is it not contradictory for someone to post an answer and vote to close the same question? [In short, common logic would suggest you should not answer a question if you think it needs to be put on hold.]
If this is not contradictory, why not? If it is contradictory, I would respectfully suggest that such members should temporarily delete their answers once they vote to close the question. They can undelete the answer if they then decide to retract their close vote after OP makes a satisfactory edit, or if the question gets reopened and doesn't ge re-closed.