Not really, since steady flight mounts don’t follow normal physics. They stay constantly in the air. That sounded like a legitimate bug X)
What doesn’t sound like a bug is being entangled in a net and falling to your death. You can’t expect to fly when you got a net around you, come on.
You’ve always been able to be slowed and rooted while flying though. This has always been the case for steady flight and most recently skyriding. If they got rid of that, it’d be significantly harder to kill someone on any type of flying mount because they could just quickly fly out of range.
I think it makes perfect sense for someone to fall straight to the ground when they’re rooted on a skyriding mount (plus its the only way I can “dismount” those pesky druids, since they’re bugged to be immune to Whirling Surge and Net-o-Matic)