As per title, this annoying phenomenon is still occurring.
What seems to happen is this:
When most of the team is dead and an objective then gets capped by one or two surviving players; the dead then respawn some distance behind while the "race leaders" sprint off to the next objective as fast as possible. While the racers are doing this, the respawned players are still scouting around for other weapons on the ground that are better than the broomstick and pea shooter they spawned with (the racers, probably, have their own loadout in tact). This further opens up the distance between them and the racers.
What can be done about this? Just vote kick them?