"CPU fence is invalid or very old!" exception is thrown on changing graphics APIs to Direct3D12 in LWRP project.

Steps to repro:
1. Create a new Project with LWRP template.
2. File > Build Settings > Player Settings.
3. Other Settings > Uncheck "Auto-Graphics API for Window" checkbox.
4. Add Direct3D12 > move to the top of the list > Apply.

Actual Result:
"CPU fence is invalid or very old!" exception is thrown in the console.

Expected Result:
No exception is thrown in console.

Reproducible in:
2019.2.0a4, 2019.1.0b2.

Working Fine in:
2019.1.0b1

Environment:
Occurs only on Windows.