Reproduction steps:
1. Open the attached “WebVideoTesting.zip” project
2. Build and Run for WebGL (File > Build and Run)
3. In the browser open Developers tools (press F12)
4. Open the Network tab
5. Disable Cache and enable Throttling (“Wi-Fi” or lower)
6. In the Player press the “Play VideoA” button
7. While the video is loading press the “Play VideoB” button
8. Observe the Player

Expected result: The video plays
Actual result: No videos are playing

Reproducible with: 2021.3.43f1, 2022.3.45f1, 6000.0.18f1

Reproducible on: Windows 11
Not reproducible on: no other environment tested

Notes:
- Only reproduces in Firefox browser
- Due to timing it might take around 4 times to repeat 6th and 7th steps for the issue to reproduce