Steps to Reproduce:

1. Apply the night vision effect to yourself;
2. Get the darkness effect.

Observed Results:
While the fog is closing in, it uses the default fog color. When done in the surface, the sky abruptly loses all detail. When the transition is almost finished, the fog quickly turns black.

Expected Results:
The fog transitions smoothly from the very beginning.

Screenshots/Videos attached: Yes

Notes: The same bug was already fixed in Java Edition here: MC-249523