https://www.irs.gov/newsroom/coronavirus-tax-relief-2019-tax-refund-interest
The answer is that it was interest on my TY2019 tax refund because the IRS slipped the filing date from April to June of last year. See hyperlink above.
This likely means we'll be seeing the same thing next year.
The amount was inconsequential, my concern was because it was not the figure I filed AND it wasn't a round number like IRS always uses (if it had been a correction).
