This only started 2 days ago but it is infuriating and making me consider a factory reset. Regardless on whether silent, vibrate or sound notifications is selected, a notification chime will always play when a notification comes through. This also bypasses do not disturb mode, making me even more confused. Very likely a glitch and interrupts all videos and such making it extremely annoying, and cannot find any other examples of this online either. Please tell me if i am being stupid to fix this.
Temporary solution is to disable the "Google" app completely. This affects Google Assistant but will stop the constant notifications.
EDIT: Disabling Google in Notification Access also fixes the issue.