The answer to your first question is No. The 1099-R was withdrawn in 2019 and the conversion made in 2019. So, it looks like the transaction has nothing to do with 2018. If you were withdrawing excess contributions and earnings, then any remedial action should have been taken before April 15 of 2019.
For your second question, converting a nondeductible IRA to a deductible IRA should trigger the 8606 basis form in 2018. Based on that, you can amend your 2018 return to establish your basis in the IRA.
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