Summary:

This is a clone of MCPE-36855. The problem is completely back!
In version 1.16.230.54, all fixes that were in 1.16.210 were removed. All blocks flash again.

At the junction of clouds and blocks between blocks and clouds, z-fighting occurs (this will be especially important when the generation of new mountains is added).

Steps to reproduce:

1. Build up to cloud level.
2. Wait for the edge of the cloud.
3. Place the block on the edge of the cloud.

Observed results:

Z-fighting occur between clouds and placed blocks.

Expected results:

There shouldn't be a z-fighting.

Video:

Minecraft 2021-06-05 19-50-07.mp4