Rendering issues above y=255

[Valiec]

In my same test at y=322, I found these rendering bugs:

Primed TNT is dark gray, not white.

Beacon beams do not render beyond the surface of the beacon block itself.

Every now and then, if I go far enough down that my platform unloads and then go back up, it is invisible but solid until I place a torch (I'm not sure if other blocks work, I used a torch) and then it reappears.

When an end portal is activated, only one of the portal blocks renders. The others are invisible.

[kvverti]

World borders also do not render outside the vanilla limits.