Horse tries to "finish" pathfinding when you interrupt it by riding it

The bug

Once a horse starts wandering to a random destination (all mobs do that), but is interrupted by the player that rides it away, it will try to get all the way back to its original destination, thus wandering hundreds of blocks depending how far the player rode it.

The bug

1. Let a saddled horse wander around
2. Once it picks up and starts wandering into a random direction mount it and ride it away
3. Get off the horse
4. Watch it going all the way back to its original destination