Well!! its quite amazing, at first I installed 20171219 update ,All was working normal except bluetooth turning on automatically.Then I formatted and updated my bv8000 pro to 20171227 and every time when I open my whatsapp then I am able to get all the notifications all together, if phone is on standby mode , no notifications at all .I checked it for a day, and after that i Rolled back to 20171219 Rom. I don't know ,why each Rom of you having some kind of problem?? may be beta testers are not that much good
Well Lets hope to get better in next update!!!!