To reproduce, find a snow biome and observe the snow layers. You would find that the snow layers are of one layer each and there is no variation. It is expected that the snow layers are of different thickness.

This bug has been occurring since 1.18, which has stripped off this exclusive Bedrock feature without a notice.

Videos depicting the expected results:

https://youtu.be/dvWDyRC0-kI  (recent versions prior to 1.18)

https://youtu.be/7LWL_BQq7vk (0.12, different generation in snow layers from above video)

The screenshot attached shows the issue.