After some research I believe I have found the most likely cause of this. According to the 1.21.11 changelog previously, a number of cutout textures, such as vines, rails and various foliage, didn't get mipmaps. 1.21.11 now applies mipmaps to essentially all block textures when mipmapping is enabled
The problem is you cant disable mipmaps with a resource pack, so fixing this is problematic
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After some research I believe I have found the most likely cause of this. According to the 1.21.11 changelog previously, a number of cutout textures, such as vines, rails and various foliage, didn't get mipmaps. 1.21.11 now applies mipmaps to essentially all block textures when mipmapping is enabled
The problem is you cant disable mipmaps with a resource pack, so fixing this is problematic