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For me to fix it I had to go to sound - > earphone mode then click on notification ringtone in headphones and I could change it from there. Granted I'm on a oneplus phone so my settings could be very different.
I have a Samsung Galaxy S10e, before the update I had figured out how to get the phone to ring as well as my bluetooth headset. After the update this stopped. Thanks to your prior posts I found another way to get it to work. If you go to "settings", "bluetooth", "advanced (on top), turn "dual Audio" on which makes you turn "media volume sync" off. However, my phone now rings as well as my headset. Hope others find this useful.