An excess contribution corrected by the due date of the tax return is not subject to penalty. It's treated as never having been made.
I've never been able to find any specific IRS guidance on the issue, but it's my belief that the deadline for obtaining a return of a 2022 to avoid a penalty for 2022 is the due date, including extensions, for the 2022 tax return, even if the contribution was made in 2023. I have heard of cases where an IRA custodian seemed to think otherwise, though.
