IOS 14 and later version seems to be impacted.
The bug is also impacting video call alert for some users.
The issue was noticed on the iPhone 12 series. The problem doesn’t seem to be with a single application or a particular generation of iPhone models. From the online platform, the complaints are registered including apple community forums, the issue are impacting almost all models compatible with ios 14. The issue doesn’t seem to be affected by the delivery of a new message.
This issue is not just limited to text messages as some users are not even getting notifications from third party apps including WhatsApp.This affects voice call alerts.