Oblique pl. *n̥s- possibly continues earlier **m̥s- (same element of sg. oblique stem with pl. s). This n was made common to the whole paradigm, with even enclitic *nos for *mos, but the verb endings *-me(dʰh₂), *-mos(dʰh₂) were not disturbed.
Dat. *mégʰi for *mébʰi is attested in Italic and Indic, but not in Iranian, as 𐬨𐬀𐬌𐬠𐬫𐬁 (maibyā). Also
サンスクリットमह्यम्(mahyam) may be from original -bʰ-, as this sometimes becomes Indic -h- (even more here by dissimilation from initial m-).