Bug 

Cooldown texture on custom items is invisible.

How to reproduce this bug:

1. Install the resoure pack and the behaviour pack I attached to this report ↓
2. Enable them in your world.
3. Take the ellis:book from creative inventory and use it with right mouse button.

I didn't add pack icons or localization, but i think it's not important.

p.s. before I updated to 1.20.80 there was no bug and i saw cooldown on my custom items as you can see it now on an ender pearl.