Entities with transparent materials that share the same mesh use the wrong material when GPU preprocessing is off

[jf908]

Bevy version

0.16 and main

Relevant system information

Repros on both Windows + macOS

AdapterInfo { name: "NVIDIA GeForce RTX 3070 Ti Laptop GPU", vendor: 4318, device: 9440, device_type: DiscreteGpu, driver: "NVIDIA", driver_info: "576.52", backend: Vulkan }

AdapterInfo { name: "Apple M4", vendor: 0, device: 0, device_type: IntegratedGpu, driver: "", driver_info: "", backend: Metal }

What you did

Render two objects with different materials but the same mesh

Repro: https://github.com/jf908/bevy-material-bug.git

If you enable GPU preprocessing by removing these lines, it works again:

What went wrong

If it's not clear, break this out into:

Expected:

Actual:

Additional information

Removing these lines (enabling GPU preprocessing) works again:

app.sub_app_mut(RenderApp)
    .insert_resource(GpuPreprocessingSupport {
        max_supported_mode: GpuPreprocessingMode::None,
    });

[MushineLament]

I use bevy-inspector-egui to modify colors. Two blocks alternate using each other's colors every 11 seconds or so. Even though I changed the colors, they still switch alternately at a fixed time. Then I tried running it on the latest bevy main and it rendered correctly. I checked the relevant code and found that this may be related to rendering caching. I suspect that it is related to the use of the pipelines_are_loaded function under PreprocessPipelines.