Prior year state estimated taxes paid don't seem to be included in the calculated total

TT 2021 Desktop: PERSONAL/Deductions& Credits/Estimates and Other Taxes Paid/Estimates

I've entered $200 as State estimated taxes for 2021. I've entered $500 as 2020 state estimated taxes paid in 2021. I click on the Done with Tax Payments button and see a total of $200 displayed on the Estimates line next to the Update button. Seems like a bug. 

Thoughts?