Web Player fails to load when "Target WebAssembly 2023" is enabled and Entities package is installed

Reproduction steps:

1. Open the attached “IN-143356” project
2. Switch to the Web Platform
3. Make sure the “WebGL” Graphics API is selected in Player Settings > Other Settings
4. Make sure “Target WebAssembly 2023” is enabled in Player Settings > Publishing Settings
5. Build and Run the Web Player

Actual result: The Web Player starts but fails to load, on WebGL shows “Uncaught RuntimeError: index out of bounds”
Expected result: A working build is generated or the build fails

Reproducible with: 6.4.0 (6000.4.0b2, 6000.4.8f1), 6.5.0 (6000.5.0b8, 6000.6.0a6)
Not reproducible with: 1.4.6 (6000.0.75f1, 6000.3.16f1), 6.4.0 (6000.4.0b1)

Reproducible on: Windows 10 (Firefox 150.0.3 64-bit), macOS 26.4.1 (Firefox 150.0.3 aarch64, Safari version 26.4 (21624.1.16.11.4))
Not reproducible on: No other environments tested