System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3060/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 471.41

Blender Version
Broken: version: 3.0.0 Alpha, branch: master, commit date: 2021-08-12 19:12, hash: rB1275ce61b1b0
Worked: (newest version of Blender that worked as expected)

Short description of error
[Please fill out a short description of the error here]

Exact steps for others to reproduce the error
[Please describe the exact steps needed to reproduce the issue]
[Based on the default startup or an attached .blend file (as simple as possible)]

When you FIX this Major BUG of Blender?
Trees, grass, windows, glasses. All this has a BUGS with Z buffer. white or black dots on picture.
no need a mist channel. in 2021 we have no float Z Buffer for use this float in compositing.
This is SHAME.