I suspect that the corrective distribution from the 401(k) itself was not eligible for rollover to a Roth IRA. When was the corrective distribution from the 401(k) made?
If it was made in 2020, what is the code in box 7 of that Form 1099-R?
If it was made in 2021, do you know what code will be present in box 7 of the 2021 Form 1099-R?
Presumably the Form 1099-R for the rollover to the 401(k) shows $60,000 with code G (or less likely, code 1 or 7). It seems that the rollover from the traditional IRA to the 401(k) would be considered to consist of $10,000 of failed rollover, so that $60,000 probably needs to be reported with two substitute Forms 1099-R, one showing a $50,000 code G rollover to the 401(k) instead of $60,000 and another with code 1 or 7, depending on your age, showing a regular distribution that you then converted to the Roth IRA, likely after the 60-day rollover deadline pursuant to IRS Revenue Procedure 2016-47 self-certification that the late rollover would qualify for a waiver of the 60-day rollover deadline.
