Stale textures while new assets loading

## Bevy version

0.10.1

## \[Optional\] Relevant system information

```
2023-06-22T12:52:20.643800Z INFO winit::platform_impl::platform::x11::window: Guessed window scale factor: 1
2023-06-22T12:52:20.731391Z INFO bevy_render::renderer: AdapterInfo { name: "NVIDIA GeForce GTX 1050", vendor: 4318, device: 7297, device_type: DiscreteGpu, driver: "NVIDIA", driver_info: "530.41.03", backend: Vulkan }
2023-06-22T12:52:20.905245Z INFO bevy_diagnostic::system_information_diagnostics_plugin::internal: SystemInfo { os: "Linux rolling Arch Linux", kernel: "6.3.4-arch1-1", cpu: "AMD Ryzen 7 1700X Eight-Core Processor", core_count: "8", memory: "31.3 GiB" }
```

## What you did

I have a material with
```
#[texture(1)]
#[sampler(2)]
pub texture: Option>,
```

and a bind implementation of
```
impl AsBindGroupShaderType for ShotMaterial {
fn as_bind_group_shader_type(&self, _images: &RenderAssets) -> ShotMaterialUniform {
let mut flags = ShotMaterialFlags::NONE;
if self.texture.is_some() {
flags |= ShotMaterialFlags::TEXTURE;
}
ShotMaterialUniform {
size: self.size,
window_height: self.window_height,
pad: self.pad,
cards_x: self.cards_x,
card_w: self.card_w,
flags: flags.bits(),
}
}
}
```

This code w.r.t. texture is copied from bevy's built in `ColorMaterial` code, but I haven't tested with that directly.

When some state changes, I replace one `Some(...)` texture with a different `Some(...)` texture. The textures have different dimensions, and I update the rendering dimensions (size) at the same time.

## What went wrong

For a short duration, the old texture is rendered with the new size. This appears to correspond to the duration the new asset is being loaded.

## Additional information

I was able to work around this by setting `texture` to `None` for one system iteration - after that, even though the texture isn't loaded for several more frames, setting `texture` to the new texture handle causes the shader to treat the texture as missing (i.e. it stops drawing the old texture).