The earnings should be taxable in 2018. The code in Box 7 should be a P which should tell TurboTax that it is taxable in 2018. If you properly added the excess amount in 2018, you should not have to amend it. If you did not add the $46 to the 2018 return, you will need to amend your 2018 tax return and add the income.
[Edited 03/24/20 | 9:06 PM]
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