Summary:
The red trade buttons in the trading GUI are not retextured in the Adventure Time and Steven Universe resource packs.

Steps to Reproduce:

1. Open a world with the Adventure Time or Steven Universe resource pack enabled
2. Spawn a villager or wandering trader
3. Open the trading GUI with no emeralds in the inventory
4. Look at the red trade buttons on the left

Observed Results:
The red trade buttons use the default texture.

Expected Results:
The red trade buttons should be retextured.

Screenshots: