There’s a hefty list of known issues for Patch 2.1.3 already. This patch had a relatively short period on the Public Test Realm, and it didn’t contain much that excited anyone enough to draw them to the PTR, so I suppose it’s to be expected. You can find a full list of issues on the WoW Bug Report Forum, or I’ve included the hunter and pet bugs below.

Items

• Crossbow and gun animations are not stopping once a player has fired the weapon.
• Crystalline Crossbow is held in the character’s hands improperly. 
•  Shooting while under the effects of Time-Lost Figurine displays no Shoot Animation.
• When arrows are pulled back on The Black Bow of the Betrayer they stick straight up.

User Interface

• The Pet info window will re-open whenever dismounting if the character info window is closed while the pet info tab is active. 
• Hunter Pets with more then 12 skills can not access the second page of the spellbook.

Monsters and NPCs

• Some major city guards ignore both Feign Death and Vanish. 
• Player pets spawn in mid-air when the dragonmaw illusion is applied. 
• Pets who are currently desummoned from mounting when a battleground ends will be lost after leaving the battleground. 
• Ahab Wheathoof is appearing when Track Beasts is enabled. 

Hunter

• Hunter’s Mark does not properly update itself when re-applied.
• Pets dismissed when a hunter mounts do not have their buffs decay in real time.

Hmm … it looks like they might be listing issues that are still open from previous patches in this list as well. That would bloat it out a bit, but … if so, it makes it a lot easier to know what the currently open issues are, regardless of when they started.