Property not found error in XAML

### Describe the bug

The famous 8.x bug of the invalid property during editing now (8.2.1) seems to be present only for RelayCommand:


As you can see, other VM.XXX attributes are ok. No underlined errors neither in cs file.

So we should be almost there with the final fix...

### Regression

_No response_

### Steps to reproduce

```text
Random, working on a MVVM dialog...
```

### Expected behavior

No underlines in source, if code is correctly built.

### Screenshots

_No response_

### IDE and version

VS 2022

### IDE version

17.6.4

### Nuget packages

- [ ] CommunityToolkit.Common
- [ ] CommunityToolkit.Diagnostics
- [ ] CommunityToolkit.HighPerformance
- [X] CommunityToolkit.Mvvm (aka MVVM Toolkit)

### Nuget package version(s)

8.2.1

### Additional context

_No response_

### Help us help you

No, just wanted to report this