Video Clip renders only in single Game Window when multiple Game Windows are open

Steps to repro:
1. Create a new project
2. Import a video clip
3. Drag and drop the video clip into a hierarchy
4. Add multiple game windows in editor
5. Enter play mode

Actual Result:
Video Clip renders only in single Game Window

Expected Result:
Video Clip render in all game windows.

Reproducible on:
2019.1.0a13 (3bff0e4c3744), 2019.1.0a12, 2019.1.0a10

Working fine on:
2019.1.0a9, 2018.3.0f2

Environment:
Windows and Mac.