The item cooldowns are rendered in front of item tooltips. This was probably caused by it having a texture file now.

This is not an issue in 1.21.1 so it seems it was introduced in the 1.21.2 snapshot cycle.

Steps to Reproduce:

1. Use the following command to give yourself ender pearls

     /give @p minecraft:ender_pearl[minecraft:use_cooldown={seconds:255},minecraft:max_stack_size=99] 99 

1. Use an ender pearl
2. Arrange them in your inventory so that they are under where an item tooltip is.
   The item cooldown renders in front of the item tooltip