Item pickup animation is darker than the actual item model

Discovered while testing MC-239083.

The bug

The item pickup animation renders the item with different shading from what it was as an item entity.

How to reproduce

1. Drop an item with a solid color directly on the ground below you, like white concrete

2. Wait until you pick it up again

3. Note how the item looks different during the pickup animation than how it did as an item entity

Expected results

The item depicted while being picked up should match the item entity perfectly in shading.

Actual results

It may require a keen eye, but there are definite differences - looking straight down causes it to look darker when picked up.