Model overrides are not applied to items shown in an open bundle

When you scroll through the items in a bundle with the scrollbar, it shows an item inside the bundle sprite, sandwiched between the bundle_open_back.png and bundle_open_front.png. This item shown here in the bundle "sandwich" does not have custom model data applied to it. It does have enchantment glint when applicable though.

Observed Outcome:
The item in the opened bundle does not have custom model data applied to it.

Expected Outcome:
The item in the opened bundle should have custom model data applied to it.

Steps to reproduce:

• Join or create a world with commands enabled
• Download and equip the attached resource pack
• /give @s carved_pumpkin[custom_model_data=2]

This is NOT a duplicate of MC-275504 as that report talks about the bundle_open_back.png and bundle_open_front.png sprites themselves, not the item displayed within the opened bundle.