Problems changing gui icon materials

[WasaTG]

Describe the bug
The material of the "back", "prev", "next" and "background" buttons in the category material selection section cannot be modified. It only lets me change the search icon.

To Reproduce

• Describe how to reproduce this bug: EX.

1. Open the configuration file
2. Try modifying the materials for that menu section
3. Reload the plugin
4. Open the marketplace menu
5. Go to your marketplace and open the category icon material selector menu

Expected behavior
No change will be reflected

Screenshots

Server Information (please complete the following information):

• 1.20.2
• Paper
• 2.36.0