@Dazsa i am also using the nightly7 however i get notified once only from each contact for the first msg only and if i don't open wazapp and check that msg i don't get notification for subsequent msg from same contact... For eg. While writing this post i got a msg on wazapp from one contact and i get notification with both sound and vibration but when i opened wazapp i see a lot more msgs from the sender after the first notified msg.

i m not sure i made myself clear. You can try yourself just ask your friend to send some random msgs and you keep your phone locked and don't open wazapp then you will be notified for first message onlye and no notification for subsequent msgs if you have same bug.

earlier i.used to get notification for each msg even if i don't open wazapp

cheers and thanks for helping