Bundle background does not handle translucent pixels correctly

MC-144009 Particles no longer support translucency MC-164001 Some textures no longer support transparency MC-109447 Inconsistency in transparency of GUI PNG files - only some can be transparent + hover-bugs MC-145821 Stained glass, ice, slime block and other transparent block particles are not transparent anymore MC-165036 Boss bars with the notched style are rendered incorrectly if more than one boss bar is active MC-200987 Title in bossbar breaks HUD opacity MC-251303 Transparent boss bars break when more than one is on screen MC-268929 pack.png does not support translucent pixels MC-270049 Enchanting table buttons and level icons render translucent pixels as opaque MC-270640 Anvil text field does not support translucent textures MC-270678 Tabs in recipe book and Creative inventory do not support translucent pixels MC-270680 Buttons in the beacon GUI do not support translucent pixels MC-270692 Textures for empty slots do not support translucent pixels MC-270697 Stonecutter recipe buttons render translucent pixels as opaque MC-270698 Loom recipe buttons render translucent pixels as opaque MC-270726 Advancement backgrounds render translucent pixels as opaque MC-270741 Realms main menu icons do not render translucent pixels correctly, but accessibility/language icons do MC-270764 Recipe book buttons and icons do not render translucent pixels correctly