From archive.org mirror of old bug tracker.
If you have Auto-Knock set, it does not trigger after trying to pick a lock. It DOES trigger after kicking or attacking a door, however. If you happen to break down the door on the attempt, the game will continue to cast knock forever with no way of stopping it unless you fail a casting.
Casting the Knock spell does not unlock chests.
Auto-Knock does not seem to work properly with chests. If you attack a chest, it will trigger (as above) but it never seems to open the chest.