"How do I reverse the wrong contribution?"

You would do a corrective distribution, as a direct transfer from the Roth to a Trad IRA.

When all of those steps are done for the same tax year and before the due date of the return, it's as if the error never happened.

There will be a 2022 1099-R for that action from Roth (code P = previous year, so report it on 2021 1040), and there will be one for the IRA for the conversion, which is a 2022 activity.

Don't overlook any earnings.