To get rid of the missed call notification from your stock dialer kindly do the following:
1. Click on the profile icon > Tap on Settings Setting_icon.png > Calls > Toggle on 'Missed call notification' and Remind me of missed calls > Enable both
1. Click on the profile icon > Tap on Settings Setting_icon.png > Calls > Toggle on 'Missed call notification' and Remind me of missed calls> Enable both