IRS periodically changes box numbers on the tax reporting documents from year to year to either add or take away boxes of information to be reported. This can be evident in comparing the blank tax documents from various years.
For example, per IRS.gov, box 13 of the 1099-R for 2019 is reporting the state ID # and box 15 is showing local tax withheld. When looking at the 2020 tax form, box 13 is reporting the date of payment information with box 15 showing the state ID box.
You will find a link to the two 1099Rs below.
2019 Form 1099R
2020 Form 1099R
Please verify the tax year reported on your copy of the 1099R to determine whether it is to be reported on the 2019 or other year return or the 2020 individual income tax return and report it only on the applicable tax year return.
