Shulker Boxes cannot be undyed using a cauldron

What's happening:
You cannot undye shulker boxes by clicking with them on a cauldron full of water.

What I expected:
I expected to be able to undye dyed shulker boxes using a cauldron, just like dyed leather armor.

How to reproduce:

• Grab a dyed shulker box
• Hold the dyed shulker box in your hand and click on a cauldron full of water
• The shulker boxes shouldn't be undyed

Screenshots Attached: Yes