Rails appear blurry at a distance of 8-10 blocks

That has to do with mipmapping and not having anisotropic filtering set up high enough, I believe. They wouldn't look nearly as blurry, if at all, if you maxed out anisotropic filtering on your video settings. It's not a bug.

There is a bug here. I will add pictures of anisotropic settings 2,4,8 and 16

anisotropic filtering 2

anisotropic filtering 4

anisotropic filtering 8

anisotropic filtering 16

This is working as intended.

There is still something going on, as the filtering does improve the problem, but doesn't eliminate it completely. In other words, the higher the filtering, the farther away the glitch appears, but it is gone completely if mipmaps are not used, regardless of filter setting.

I think the problem would be lessened if the mipmaps for rails were set up better, such as with more transparency so the blocks underneath the rails would show around the edges, instead of the sudden jump to a flat grey that they show now.

@unknown in MC-50955

This isn't a lighting glitch, this is mipmapping or anisotropic filtering at shallow angles.