Two mysterious white pixels on the recipe book still can be seen if you have a resourcepack that modifies the recipe book.

The Bug:

MC-219211 claims to have been fixed in 21w16a, however the bug hasn't been completely fixed.

Steps to Reproduce:

• Download the attached resourcepack
• Go into a crafting table or anywhere the recipe book may be present
• Look at the recipe book
  →  Notice how there are STILL two mysterious pixels on the upper left corner of the icon.

Information:

This likely started happening in 21w10a alongside MC-219211, with the introduction of the OpenGL 3.2 core renderer.