Thanks for checking, I just tried it again and it was just a visual bug when out of range.
Normally it just says target is too far but when out of movement it displays the percentage and disadvantage instead so I didn't notice I was out of movement. When in melee range it does correctly show advantage.
Pretending to respond to someone just to bump this back up to the front page...I mean, yeah, I've seen a few visual bugs like that when it comes to targeting. I'm sure they'll get those all ironed out before too long, though. They seem to be fixing bugs at a pretty solid pace so far.