Yes, you will have to file the corrected 2021 Form 8606 with an explanation. Ignore the penalty and waiver part.
To confirm, the basis on line 2 on the 2021 Form 8606 (which should have been carried over from line 14 of your 2020 Form 8606/ last filed Form 8606) was still in the traditional IRA account by the end of 2021, correct?
@Polaris23
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