It is back, and is similar, but not quite the same:
-If you die and respawn in Captain, sometimes the new troop is in a very slow state.
-If you caps-lock to go into walking mode, you use the walking animations but now move at double speed (this is hilarious).
-It does not seem to be related to formations, but taking over an AI while it was in the middle of some other action.
This bug existed alongside the formation-based slow bug since December or so, but is much rarer and not as game breaking since you can move at double-time.