Summary:
In Java Edition 1.18.1, the following change was made:

World fog now starts further away from the player, to make distant terrain more visible

This change has not been made in Bedrock.

Steps to Reproduce:

1. Create a new Creative world in Bedrock and Java with the same seed
2. Set the render distance to the same number
3. Fly up and observe where the fog starts

Observed Results:
Fog starts closer to the player in Bedrock, which results in distant terrain being less visible.

Expected Results:
Fog in Bedrock should start at the same distance as in Java.

Screenshots:
Both screenshots were taken with 8 chunk render distance.

Bedrock:

Java: