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Clouds are transparent when you are above/in them but not when you're underneath them.

Clouds still pass through objects

partial transparency gets opaque in F1 mode

Fancy Graphics-Leaves aren't transparent behind slabs

ice block isn't transparent

Partially transparent textures render incorrectly

RenderPass issue

Water Isn't Transparent

Transparent Textures are Broken At Certain Transparencies

clouds are rendered in front of partialy transparent blocks when viewed from above

Transparent colored glass

Backface culling should not be used improperly

Transparency acts strangely with resource packs

Custom glass texture transparency flashing

Draw order-related graphical errors involving stained glass

You can't see through ice while holding it.

Semi Transparent Glass Issue

Chat Opacity Option is not working

Experience Bar Loses Transparency

Custom resource pack: Transparency issue with cloud rendering

Stained glass transparency bug while viewed as an held item.

Iron Bars, Regular Glass Panes and Cauldrons aren't transparent.

Transparency not functioning correctly on iron bars and uncolored glass panes

glass pains aren't transparent

Glass panes become opaque when near it

Minecraft has transparency with the Desktop

Transparency on texture-edited Solid Blocks does not render at close range.

Empty Carpet texture pixels no longer Transparent (also true for all blocks)

TNT/Creepers flash white when exploding

Barrier Light Glitch/Bug