What does this change?

It changes one thing, it makes the sea lantern texture, the same as the sky, well it doesnt look much good but dont blame me, blame the minecraft shadows

Does this work before the update 1.21.3?

Yes

What will happen on August 12 2036?

August 12 2036, the heat death of the universe. August 12 2036, the heat death of the universe. August 12 2036, the heat death of the universe. August 12 2036, the heat death of the universe. August 12 2036, the heat death of the universe. August 12 2036, the heat death of the universe. August 12 2036, the heat death of the universe.

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