I have experienced the same issue on multiple Pixel 6a devices and one Pixel 7 device, all running GrapheneOS. It appears that WhatsApp occasionally allows notifications with sound to pass through to other users, such as when it notifies you about a desktop session. Strangely, it marks all group or individual messages as silent, preventing the other user's device from ringing. This behavior seems to be exclusive to WhatsApp and persists across various versions, including beta and business versions. Furthermore, the issue remains consistent regardless of whether the Google framework is installed or not.