Relates to MC-276728.

The bug

If a bundle has a different item model as given via a command, it will appear darker than normal when the player scrolls through the contents.

How to reproduce

1. Get a normal bundle

2. /give @s bundle[item_model="minecraft:stone"]

3. Put items in each
4. Scroll through each
5. Compare visually

Expected results

The custom model bundle would not appear darker than the normal bundle.

Actual results

It is.

How to fix

Whatever hardcoded thing is overriding the inventory model needs to be revised, possibly component-driven.