The bug

The texture of end gateways and end portals are adjusted incorrectly as the player travels further away from them. Previously, the size of the "particles" within the texture remained the same as the player travelled further from the block. However, in 21w10a, these particles expand as the player views the block from further away.

In 21w08b and earlier, the player would see the following when viewing an end gateway or end portal from far away:

Notice that every particle within the texture is roughly the same small size.

In 21w10a, the player would see the following when viewing an end gateway or end portal from far away:

Notice that some of the particles are very large. When viewing the block from a closer distance, these particles would not appear as large.

How to reproduce

1. Fill an area with end gateways in 21w08b:

   /fill ~ ~ ~ ~10 ~10 ~ end_gateway

2. Move further away from the end gateways
   The particles within the texture of the block remain small
3. Fill an area with end gateways in 21w10a:

   /fill ~ ~ ~ ~10 ~10 ~ end_gateway

4. Move further away from the end gateways
   The particles within the texture of the block expand as the player travels further away from the block