Nautilus, Zombie Nautilus, Nautilus Spawn Egg, and Zombie Nautilus Spawn Egg appear invisible when using a resource pack with a format version of 1

Steps to Reproduce:

1. Download and import [mediaInline] or the Minecraft Classic Texture Pack from the Marketplace

2. Open a world with the pack enabled

3. Search for the Nautilus and Zombie Nautilus spawn eggs in the Creative inventory

4. Notice that they appear invisible

5. Spawn the Nautilus and Zombie Nautilus

Observed Results:

The Nautilus, Zombie Nautilus, and their spawn eggs appear invisible.

Expected Results:

They should be fully visible.

Video: