Hello, Peter. If you are interested, the possible patch (based on FPI mask during replay) was sent with some additional explanation and graphics to (1). At the moment I unable to find any "incorrectness" in it.
Thanks again for your comments. Michail. [1] https://www.postgresql.org/message-id/flat/CANtu0ohHu1r1xQfTzEJuxeaOMYncG7xRxUQWdH%3DcMXZSf%2Bnzvg%40mail.gmail.com#4c81a4d623d8152f5e8889e97e750eec
