@gianola
I just tried a test entry for the 2019 sale of stock acquired via an ISO some years prior to 2019 using a desktop version of TurboTax and I saw that the reversing adjustment properly carried over to California Schedule P(540).
If you are using an online version I can't make a similar test.
One of the first things I might try here is to delete the trade entirely, and then re-enter it.
