@AnnetteB6
With the automatic Maryland update to TT dated 3/8/2023, the issue appears to be solved: when I change the Q1 estimated tax payment date from the placeholder 4/15/2022 to the actual 7/13/2022, and Q2 payment date from 6/15/2022 to 7/13/2022, TT no longer generates an MD Form 502UP or incorrectly calculates an underpayment penalty.
However, contrary to what you stated, the registration for the notification of a fix is still active at:
Why am I seeing interest charged on my MD Form 502UP?
