I prefer it be consistent, either way.
Recall one story (a "free" book on Kindle that made me almost want a refund despite being free) that went from third person narration when dealing with most of the cast to first person narrative when dealing with one of the two (I think ... it wasn't always clear) sisters who were the "joint MCs" of the story. The 3p parts were nicely atmospheric, even if a bit bland and basic at times, but were also the minority (in page count at least, from the quarter of the way I got into it), but the 1p parts, which kind of rode along with one sister, then jumped to the other, were amateurish and unsatisfying.
But then the late Peter David wrote a novel I keep referencing, Howling Mad, which had third person parts with the "journalist" interviewing the main characters, with occasional chapters told from inside one character's head - and he had a lot of fun with that, and with jumping between them, and it worked.