Finally found a workaround after comparing forms between 2019 and 2020.
On the Capital Gain (Loss) Adjustments Worksheet, under Section III Specific Adjustments, I had to check the box that says, "Check this box for employee stock sales requiring adjustments." As soon as I clicked that, all the fields filled out and cost basis appeared to work as expected.
Note: I did not see a place in the "Easy Step" UI that allowed for this box to be selected. It seems like 2019 did it on its own, but that dropped out in 2020. Therefore, I only was able to do it by modifying the form directly.
Hopefully this helps you all and helps the dev folk fix the bug.
