split_screen example doesn't render most assets

I don't see anything
```
Running `target\debug\examples\split_screen.exe`
2025-05-16T10:40:12.764323Z INFO bevy_diagnostic::system_information_diagnostics_plugin::internal: SystemInfo { os: "Windows 11 Pro", kernel: "26100", cpu: "12th Gen Intel(R) Core(TM) i7-12700H", core_count: "14", memory: "31.7 GiB" }
2025-05-16T10:40:12.911438Z INFO bevy_render::renderer: AdapterInfo { name: "Intel(R) Iris(R) Xe Graphics", vendor: 32902, device: 18086, device_type: IntegratedGpu, driver: "Intel Corporation", driver_info: "Intel driver", backend: Vulkan }
2025-05-16T10:40:13.676064Z INFO bevy_render::batching::gpu_preprocessing: GPU preprocessing is fully supported on this device.
2025-05-16T10:40:13.719942Z INFO bevy_winit::system: Creating new window split_screen (0v0)
2025-05-16T10:40:31.912440Z INFO bevy_window::system: No windows are open, exiting
2025-05-16T10:40:31.922471Z INFO bevy_winit::system: Closing window 0v0
```

_Originally posted by @BenjaminBrienen in https://github.com/bevyengine/bevy/issues/19147#issuecomment-2886353589_

Start by reproducing the split_screen example on the reported Windows and Intel Iris Xe setup, then inspect the example's asset-loading and rendering entry points. Done means the example opens and renders the expected assets instead of showing a blank result; the issue does not name specific files or tests.

Written by the indexing model from the issue text.