The enchantment glint sometimes doesn't render in interfaces and first person

Can confirm.

I was unable to reproduce. Please provide a screenshot with your debug screen enabled (F3)

Yes, same for me. Glint is gone in latest snapshot.

The glint is gone in first person and in the GUI, but not on the floor or in an item frame, or in third person:

Can confirm. The glint is only visible in third person, item frames or dropped on the ground

Also it seems that the cause of this bug is because Mojang removed some unused shaders like blend or position_color_tex... however, some of these unused shaders also include glint_direct and armor_glint

i assume glint_direct was used for rendering in-game items and first person

@unknown I was unable to reproduce it too.

@unknown I still can confirm in 24w21b:

Only appears in third person:

@unknown Weird. For reference, this is a newly-created world for this snapshot, and my Glint Speed is set to 50% and Glint Strength to 75%. But, it may just be that some users don't experience it, not sure.

Edit: Unlikely, but could this depend on the graphics card?

Never mind, I can confirm now. Not sure what I did to make this happen, though. 

can confirm