In version 21w08b and earlier, the world border was blue when stationary, green when expanding, and red when shrinking. In 21w10a, the border now renders as white regardless of its state.
How to reproduce
- Run the command /tp @s ~ ~ 29999980
- Look at the border
It is white, unlike the blue color it previously was
- is duplicated by
MC-219079 World border color depends on fog color; hard to see it at night