It looks like the player does grab the ladder/vine, but stays sideways until reaching solid ground/going back to gliding.
This also happens without ladders or vines.
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Looks like the player turns on its side when hanging onto ladders/vines from in-flight. Updating ticket accordingly.

Confirmed for 15w43c.

Confirmed for 15w44a.

Confirmed for 15w46a

Is this still an issue in the most recent versions (currently that is 1.10.2, or 16w42a) of Minecraft? If so, please update the affected versions and help us keeping this ticket updated from time to time.
Resolving forward to MC-181685.
By stalling, you mean look straight up? I think this is the necessary thing. look up to get into standing position, then grab. done.
But hey, that's my OPINION. Qualification to being a bug is unknown. ask Mojang.