مَرَرْتُ بِزَيْدٍ وَعَمْرٍو: the first prepositional object is an overt noun, so the second noun can be coordinated without restating bi-.
مَرَرْتُ بِكَ وَبِزَيْدٍ: the first prepositional object is an attached pronoun; the book requires the preposition to be repeated.
This is the grammatical formulation used by this text; it should not be confused with differing analyses elsewhere.
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Coordination (ʿAṭf bi-l-Ḥurūf): Rules and Parsing
مَرَرْتُ بِزَيْدٍ وَعَمْرٍو: the first prepositional object is an overt noun, so the second noun can be coordinated without restating bi-.
مَرَرْتُ بِكَ وَبِزَيْدٍ: the first prepositional object is an attached pronoun; the book requires the preposition to be repeated.
This is the grammatical formulation used by this text; it should not be confused with differing analyses elsewhere.