Interesting....since 1950, I have 1955-1956, 1971-1972, 1974-1975, 1984-1985, 1999-2000, 2008-2009, 2011-2012, 2017-2018 and 2021-2022 as second year La Nina evemts. The only two DM periods that did not average -PNA out of that data set are 1999-2000 and 2011-2012, which preceeded swings back towards Pacific warm phase from cold phase.
2021-2022 actually had an extensive mid season +PNA mismatch period, but the seaonal mean was biased negative due to the the very stout RNA that ruined December....I could see a similar outocme this season with perhaps not as promounced -PNA, as that was record setting.