I opened a support ticket today for the 2210 issue with an overpayment for Q1/Q2 not being properly credited against Q3 using the regular method/Part IV. Support directed me to https://ttlc.intuit.com/community/tax-topics/help/why-is-my-form-2210-not-calculating-lines-18-26-co... to sign up for notifications on a fix as the issue appears to be known within Intuit now. Fingers crossed.
