System Information
Operating system: Windows-10-10.0.18362-SP0 64 Bits
Graphics card: GeForce GTX 1080 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 441.66
Blender Version
Broken: version: 2.82 (sub 7), branch: master, commit date: 2020-02-12 16:20, hash: rB77d23b0bd76f
Short description of error
'Render region' doesn't account for different aspect ratio. There are clipping issues that mess up the viewport render
Exact steps for others to reproduce the error
Open the attached blend and set the viewport to rendered mode. Toggle 'render region' on and off to see the issue come and go.
Here's a before and after (render region off, then on, with aspect settings visible)

