Error: Constituent can only have one primary phone - when updating identical phone numbers through batch

When a constituent that has two phone types of identical numbers (for instance, 1-800-945-3669 as both Home and Cell numbers) has information updated through a Constituent Update Batch, users may receive the error:

Constituent can only have one primary phone.
Download and install the latest patch, which contains all fixes from previous patches. If you are running an older version, download and install the latest version and then the patch. 

Environment

 2.91.1535
 2.93.2034, patch 67 ; 2.91.1535, patch 94 ; 2.9.1001, patch 134

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