Thanks so much Joe, this was the issue for me! Don't know why there are so many copies of the same contact! Do you suppose it's because of using Samsung Smart Switch? - maybe it copies the contact each time (I've migrated from s4->s7edge->s10 and had 3 "phone" contacts all the same). One of the google versions of this contact did not have the phone number. As soon as I put it in, I was able to save the edit (which was changing the ringtone, which I'm surprised did not save in my "smart switch".
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