Summary:
The icons for the "Follow Me", "Over There!", "Simple Clap", and "Wave" emotes display as a pink and black checkerboard in the following mash-up worlds:

• Adventure Time
• Star Wars
• Steven Universe

This issue only occurs in the mash-up worlds, it does not occur in a normal world with the resource pack enabled. Other official mash-up worlds may also be affected, but I do not own them currently, so I am unable to test them.

Steps to Reproduce:

1. Open the Emotes tab in the Dressing Room
2. Equip the emotes from the list above
3. Download one of the mash-up packs from the list above
4. Create the mash-up world
5. Open the emote wheel (press B on Windows)
6. Observe the emote icons

Observed Results:
The emote icons are displayed as a pink and black checkerboard.

Expected Results:
The emote icons should be displayed correctly.

Screenshots:
Mash-up world:

Normal world: