If the cents were omitted on a previous year's 1099-G, it is doubtful that it would have any effect on your tax position. You only need to report interest you received in 2020 on your 2020 tax return. Anything you received in 2017, 2018, or 2019 has to be reported on that year's tax return. You file one tax return for each tax year and you can't report income from one year on a different tax year's return. If you need to change the interest you received in 2017, that would need to be done as an amendment to your 2017 tax return.
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