"Should I be concerned?" - No. You have a copy of your original return, right? The IRS knows that this has been a grueling period for them especially, so the idea of a form on a paper return getting mislaid won't be shocking.
If anyone ever writes to you about it, just produce your copy of the form(s) in your response. The IRS has a multitude of other fish to fry this Lent.
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