Deferred example shows differences between rendering methods

## Bevy version

bf30a25ef

## \[Optional\] Relevant system information

```ignore
AdapterInfo { name: "NVIDIA GeForce RTX 4070", vendor: 4318, device: 10118, device_type: DiscreteGpu, driver: "NVIDIA", driver_info: "537.58", backend: Vulkan }
SystemInfo { os: "Windows 11 Pro", kernel: "22621", cpu: "13th Gen Intel(R) Core(TM) i7-13700K", core_count: "16", memory: "31.7 GiB" }
```
## What you did

```
cargo r --example deferred_rendering
```

## What went wrong

Expected all 3 methods to produce the same rendering. Forward+Prepass looks different.

## Additional information

Deferred (or Forward)


Forward + Prepass : feels "less deep" than the others (very noticeable when switching between the two, less so in a screenshot), note the left side shadow band where Deferred had a white highlight