UI elements in master (non-development) builds will flicker continuously when the new "Graphics Jobs (Experimental)" feature is enabled.

Reproduction Steps:
1. Build & Run the attached project for PC or PS4 in non-development
2. Observe the UI flickering constantly (see the attached GIF)
3. Re-build in development, or with Graphics Jobs disabled (in Player Settings > Other Settings)
4. Observe that the UI is rendered normally

Expected Result:
Enabling Graphics Jobs should not result in the UI becoming unusable.

Reproducible in versions:
- 5.4.0b20 (f89b2ef776c7)
- 5.4.0b19 (0df597686c75)

Not reproducible in versions:
- 5.4.0b17 (a34abf3bb95e)
- 5.4.0b18 (5744ebf94ac5)

Also not reproducible in version 5.3.5p1 (04596651afa0), however the Graphics Jobs feature is specific to 5.4 (or later) versions of Unity.