Summary:
When the GUI scale is switched from 0 to -1, all the top textures of blocks in the inventory become blurry.
Steps to Reproduce:
Place some blocks in your inventory
Set the GUI scale to -1
Look at the top texture of the blocks
Observed Results:
The top textures are blurry.
Expected Results:
The top textures remain clear and look the same as they do when the GUI scale is set to 0.
Can confirm that the top side of the block is blurred. Possibly the noticeable one is the note block.