Yes, agreed. In all the MM roms I've tried (especially cm) . I've faced that bug just once, in the very first build of RR, after that, neva..CM based ROMs don't have this bug.Mostly all AOSP CAF ROM are facing this bug.
Perhaps this cud be helpful to people.. on that build i removed all the duplicate contacts with merge+, and took a contacts back up in a .vcf file. Now whenever i use a new rom, i either sync it with my google contacts, or just import my contacts backup. Hope this helps.
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