Apply a texture pack which its leaves contain transparent pixel, then join a world and place the leaf blocks as attached images show. The bug occurs on a lot of texture packs.
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This is not specific to texture packs and can be reproduced with the default textures.

Is it possible that this issue is caused by an intentional performance optimization feature?

While it was an intentional performance optimization, it broke the graphics. And there are obviously better and faster ways

Well I don't think that's intentional. It makes the textures look so bad and it doesn't seem to do any improvement on the performance.

Well I don't think that's intentional. It makes the textures look so bad and it doesn't seem to do any improvement on the performance.

Thank you for your report!
After consideration, the issue is being closed as Working as Intended.
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