Parties only partially migrated to new host?

Maybe this is a portion of what's already described, but one of the things that annoys me about host migration is being in a party of people and only one or two migrate when the host of the game quits. Now we're split between those in the game and those not, and joining sometimes fails.

If I'm the one in the game, I'm likely to quit to do what I planned to do in the beginning--play with my friends. I'm sure you're all nice people, but given the choice of MP with strangers or buddies, I'll take buddies. Irritatingly enough, I often THEN find out I was the new host. Sorry, guys, but it won't let the friends I'm actively speaking to join.

This is a very specific pet peeve of mine. If we're all in or all out, it's fine. Irritating, maybe. Time consuming, yes. But when we're split? RAAAAAAAAAAAAAAEG!

This happens enough and to enough people I can't help but think it's a problem with the game itself. It seems to run parallel with other complaints of connection/party issues.

So two parts to this: Making sure Uber knows, and wondering how common this is.