I get the same result as you did, if I calculate the taxable part of SS with the UC included, and the same result as IRS did, if I calculate it by disregarding the UC.  

I tried to find the announcement from back in April (or thereabouts) when IRS said the $150K limit was figured without adding the UC.  I think it was based on a statement from Sen. Wyden that the amendment to ARP meant to do it that way.  I can see where the same language could be read to justify disregarding UC when figuring the taxable SS, but I don't think any announcement of that has been made and the IRS has not changed the "Unemployment Compensation Exclusion Worksheet."  

It's already August so I'm not going to worry about 2020.  It's time to start guessing when Congress will enact a UC exclusion for 2021.  Maybe in January?