Operating system: Windows 10 Pro
Processor: Intel i7-7800X 3,5GHz
Graphics card: Quadro 4000
Worked: 2.79 (it also worked in older 2.8 beta releases, but i cannot find them to test)
Short description of error
Cycles rendering changes manually set processor affinity
Exact steps for others to reproduce the error
Turn on blender. Manually set processor affinity to use only some of the processors. Press render. Wait until it start rendering tiles. After start of tile rendering affinity is reset to use all processors.
Eevee and Workbench do not have this issue. Only Cycles.