CommunityToolkit.MVVM 8.4.1 and 8.4.2 seems to break intellisense on VS2022

### Describe the bug

when updating from CT 8.4.0 to 8.4.1 or 8.4.2, intellisense starts showing red squiggles on all the ObservableProperties.

I know this is probably not your fault, probably an Intellisense problem, feel free to close it. At least will be useful as a reference for other users.

### Regression

_No response_

### Steps to reproduce

Given the following environment (NET 9, VS2022 17.14.31 , CT.MVVM 8.4.0 )

[ObservableProperty] private string _searchText = string.Empty;
...
SearchText = "hello";

Compile, no intellisense problems.

Change CT.MVVM to 8.4.2.
Compile, intellisense shows squiggly lines.

### Expected behavior

Not showing red lines.

### Screenshots

_No response_

### IDE and version

VS 2022

### IDE version

17.14.31

### Nuget packages

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

### Nuget package version(s)

8.4.2

### Additional context

_No response_

### Help us help you

No, just wanted to report this