Some items had broken animations in first-person view since 1.20 was released, and I'm showing here that the breathing, bouncing up and down, and attacking or mining of these items in first-person view are not correct compared to regular Items.

Broken animation Item list:

• Warped Fungus on a Stick
• Snowball
• Campire
• Soul Campire
• Music Disc (Including all variants)
• Item Frame
• Glow Item Frame
• Flower Pot
• Coal
• Charcoal
• String
• Redstone Repeater
• Redstone Comparator
• Hopper
• Nether Sprouts
• Kelp
• Sugar Canes
• Cake
• Arrow
• Tipped Arrows (Including all variants)
• Chain
• Apple
• Trial Key
• Cauldron
• Wind Charge

I have uploaded four examples comparing how to breathe and attack correctly and incorrectly in first-person view; please see the attached files. If you want to check it yourself, make sure to create a Flat World first, then grab the items I put in the broken animation item list, and finally you'll see how it breathes (make sure your view-bobbing is on) and attacks in first-person view. You'll notice how they differ from regular items.