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Cycles does not render geo with Multires modifier while in Sculpt mode
Confirmed, LowPublicKNOWN ISSUE


System Information
Operating system: Windows 10, Linux
Graphics card: Nvidia GTX 960

Blender Version
Broken: (example: 2.80, edbf15d3c044, master, 2018-11-28, as found on the splash screen)
Worked: (optional)

Short description of error
Adding a Multires modifier with the Sculpt parameter > 0 (to further develop the model I'm working on) makes the geo disappear when using Cycles in the viewport, while in Sculpt Mode. As a first time Blender user, I'm not sure if this is the expected behaviour for this. I have checked with other users and they can reproduce the error.

It would be useful to render in viewport without leaving Sculpt Mode.

Exact steps for others to reproduce the error
Create a geometry. Add a Multires modifier. Set Sculpt to a value greater than 0. Enter Sculpt Mode. Change the viewport render from Eevee to Cycles. The geometry disappears on rendering. I have a sample of the problem in this tweet I published several hours ago: