Describe the Bug

In the latest version if I have shulker with only one item type i.e. my fireworks shulker has only one type of fireworks then no icon appears.

Steps to Reproduce

Put 1 item type in a shulker and then stick it in your ender chest and you won't see an icon.
Stick a variety of items in and you will get the item.

Expected Behavior

Expected to see multiple icons.

Screenshots

Fabric Version

0.16.9

Mod Version

2.4.5

Log Output

No response

Additional Context

No response

Actually I think I've got the report wrong, this is actually failing on shulkers that I've renamed not single items. So for example the red box in my ender chest has been renamed "redstone shulker".