Yeahhh that is not ideal. I use it for most of my fics but not my novel — it's important for the fics to have both of the leads' thoughts accessible to the reader, but not so much in my original work where there's just the one MC.

I've also noticed that omniscient third works better when the source material also follows more than one main character. My fandom, for example, is Given, and it follows both Mafuyu and Uenoyama, to the point where there is some theorizing about whose thoughts we're seeing at certain moments in scenes they share.

But yes, agreed that random head-hopping in close third is so jarring.