I've just bought a new iPhone 12, and I've connected my watch, but it seems that it's not receiving all the notifications. I receive notifications from iPhone's Messages, Flashscore, Gmail, sometimes Skype, but it fails to deliver notifications from Facebook, Messenger, Viber and Instagram App. The watch was working without a problem on my Xiaomi Poco F1, and when connected, the Bluetooth icon was all-time green. However, now when connected with the iPhone, the Bluetooth icon on the watch is blinking green and white. I've tried all the steps in the "My Garmin Device Is Not Receiving Smart Notifications from My Phone" post, nothing helps.
It's not logical to receive notifications from some apps and totally dismiss others. Can you please tell me what seems to be the problem? How can I fix this?