7 of the 12 recessions marked on the graph temporarily jumped up then dropped back down during the recession.

A note though that the "2 quarters negative real GDP growth" has only ever been a rule of thumb that tends to fit (on that graph above, the dips below 0 outside of recessions only ever lasted one quarter). The official determination has always been made by NBER ( https://www.nber.org/ ), and how they determine it is more complicated (though AFAIK the details aren't public). I think it's too soon for them to make a determination on this one though, they make it while looking backwards, so these two quarters may yet become official which would maintain the pattern.