On Warmane's TBC server, the BE paladin just learned the 'summon warhorse'
But as it tries to follow the party leader, it will mount up, walk 1 step, then dismount, then mount up again, then walk another step, then dismount.
Tested it with both narrowing and expanding the latency, but it doesn't seem to help in the slightest.
Running it shows this kind of log when party leader is mounted and away from the party bot