The Second Generation (V2) Mavic Air propellers further improve efficiency, provide even longer flight time per single battery charge and offer better compatibility with all Mavic Air firmware versions in all flight modes. Further, the Second Generation (V2) propellers completely eliminate the occasional "Motor current error" which some users have experienced with latest DJI firmware.
All Mavic Air STEALTH propellers manufactured and shipped after 23rd of May 2019 are Second Generation(v2).
How to confirm? - each propeller is engraved with "V2" on the bottom of the blade near the propeller hub.