System Information
Operating system: macOS-10.13.6-x86_64-i386-64bit 64 Bits
Graphics card: Intel(R) HD Graphics 6000 Intel Inc. 4.1 INTEL-10.36.23

Blender Version
Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-03-20 21:00, hash: rB9ca67c47a152
Worked: 2.92 stable release

Short description of error
Enabling ambient occlusion leads to darkening of reflective surfaces. The darkening seems affected by the roughness of the surface and the AO distance parameter. Perhaps related to {893655026933}.

Exact steps for others to reproduce the error

1. Create new file (or open attached .blend file).
2. Add glossy material, and set the rougness to 0.
3. Enable ambient occlusion. The reflections should appear black.