Reproduction steps:
1. Open the “ReproProject“ project
2. Open the Build Profiles window (File > Build Profiles)
3. Switch the Platform to “Web” in the Build Profiles window
4. Build and run the project (File > Build And Run)
5. Observe the browser window

Expected result: A video plays and no errors are thrown
Actual result: The video does not play, and a “TypeError: Cannot read properties of undefined (reading 'importExternalTexture')“ error is thrown

Reproducible with: 2023.3.0b6, 6000.0.0b11
Not reproducible with: 2021.3.36f1, 2022.3.21f1, 2023.2.14f1, 2023.3.0b5

Reproducible on: Windows 11 Pro (22H2)
Not reproducible on: No other environment tested

Note: The video plays as intended in the Editor, the error is thrown only when the project is built for the WebGL Platform