1.21.5+ remove inventory highlight slot

This is a limitation of Minecraft 1.21.5+.

1

Step 1

Download the fix and extract it into your ItemsAdder folder.

2KB

remove slot background.zip

archive

Open

2

Step 2

Regenerate your resourcepack using /iazip. Reupload your pack if needed, refer to the hosting tutorials.

This removes the highlight effect from any inventory, not only custom inventories, so it might not be the best solution for every server. For now I have no better solution and it might not be possible to find another one.