Lost Contact Details after Update to Android 7.1.1

Hi guys,
I don't know whether anyone else has faced the problem I am going to share. I am a beta user. After upgrading to 7.1.1 my phone has lost the names of many contacts though it does show their contact numbers. I mean I could add their names again but this is happening for the second time, it first happened when I upgraded to Nougat from Marshmallow. Is there any easy fix for this?

Thank you

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