World border does not render when below the world

The bug

The world border no longer is rendered when going below the world. It can be seen going down forever when above the minimum height, but when below the minimum height, no part of the border is rendered at all.

A video is attached.

How to reproduce

1. Run the command /tp @s ~ 100 29999980

2. Dig down until you reach the bottom of the world
   ❌ When below Y = -64, the border stops rendering