Items in command completion screen are all displayed as stone blocks

Steps to Reproduce:

1. Create a new world with cheats enabled
2. Type /give @s (any letter here) in chat
3. Look at the items in the command completion screen

Observed Results:
All items are displayed as stone blocks.

Expected Results:
The items should display their correct textures.

Notes: /clone, /fill, and /setblock do not have this issue.