Many Android 16 users are experiencing issues with receiving notifications.

A strange bug is silencing alerts, but a fix is already on the way.
Google has recognized a bug and announced that a solution has been developed internally and will be included in the next quarterly release. The update could arrive this month with the QPR1 update or in December with the QPR2 release. In the meantime, some users have been using third-party apps like Notification Manager as a temporary solution.
Similar notification issues are often reported by Apple users after major iOS updates. Samsung's One UI also experiences these issues. These bugs are usually resolved in later releases, demonstrating that both operating systems deal with software improvements after launch.
While the bug is frustrating, Google's prompt response and commitment to a fix are encouraging. Pixel users will need to pay close attention to their notifications and hope for a quick release of the official patch.
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