System Information
Operating system: Windows 10
Graphics card: GeForce RTX 2070 (2 cards)

Blender Version
Broken: 2.92 Alpha, fb4113defb46, master, 2020-11-12
Worked: 2.91, 0f45cab862b8, master, 2020-11-25

Short description of error

Cycles, with glass shader, in render view and edit mode causes this error. Blender needs restart, otherwise render view does not update.

Exact steps for others to reproduce the error

1. Switch to Cycles Render
2. Apply glass shader to cube
3. Switch to render view
4. Go to Edit mode
5. Switch to face selection mode
6. (if needed) Select a face.

Notes: Not clear if this is a Blender issue or a Nvidia driver issue. Will keep an eye on driver updates and whether it solves this.