System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 1070 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 456.71

Blender Version
Broken: version: 2.93.0 Alpha, branch: master, commit date: 2021-03-12 21:29, hash: rB258b15da74ad

Worked: version: 2.93.0 Alpha, branch: master, commit date: 2021-03-03 22:32, hash: e4a55b46c406

Short description of error
Rendering / Preview artifacts in Eevee (this artifact appears when rendering in final not just a preview)
The artifacts are a mix of the "bloom" and the spotlight's contact shadow setting.

Exact steps for others to reproduce the error
Open test file and switch on Eevee render preview.

Included test file.
As well as screen cap:
001 - the working version
002a - artifact with bloom and contact shadow on
002b- artifact with bloom off and contact shadow on