Grid on meshes in Simple Composure sample flickers intensely

See attached gif.

Setup:
GitHub build compiled on Linux at the same CL as your sample.

Repro:

1. From the Launcher, download and create a SimpleComposureProject.
2. Transfer the project to a Linux machine
3. Open the project on the Linux machine with your GitHub build
4. Skip conversion when prompted.
5. In the project editor, observe the Viewport.

Result:
Grid overlay on meshes flickers intensely

Expected:
No flickering of grid overlay on meshes