I got this boarding by zone for the first time on september 25th and everytime since then:




But it seems they don't display "Zone 3" anymore at the beginning of boarding, only "Zone 1" (the display in the above picture was very confusing for passengers having zones 2, 4 and 5...).
Then they display "Zones 1-2" and then (I guess) Zones 3-4-5 on the second lane.