[Workaround] Nested types used for generic are not patched

```c#
Preserve]
public unsafe class CharacterSkillCreationSystem__Patched_: SystemMainThreadFilter
{
public struct Filter
{
...
}

public override void Update(Frame frame, ref Filter filter)
{
```

We can see that this Photon Quantum Pattern does not get rewritten correctly. Nested filter type should be patched so it does not conflict with the original one. (Or vice-versa)

Start by reproducing the Photon Quantum pattern shown in the issue, then trace the hot-reload rewriting logic for generic types that contain nested types. The fix is complete when the nested Filter type is patched consistently and no longer conflicts with the original type; add or run a regression check if the project has one.

Written by the indexing model from the issue text.