When I use the "Clarity" texture pack from Marketplace, that is a 32*32 resolution pack while vanilla is 16*16, some block items in my hand, their models became bigger than vanilla resolution in both first person and third person.

Here is the block item list that I have found:

• Kelp
• Sugar Cane
• Campfire
• Soul Campfire
• Brewing Stand
• Item Frame
• Redstone Repeater
• Redstone Comparetor
• Hopper
• Glowing Item Frame
• String
• Cauldron
• Flower Pot
• Chain