error MC1000: Unknown build error, 'Object reference not set to an instance of an object.'

### Description

WPF/XAML project fails to build with this error:
> error MC1000: Unknown build error, 'Object reference not set to an instance of an object.'

Detailed build log is here:

https://raw.githubusercontent.com/matthew-a-thomas/dotnet-error-mc1000/7cb13040dd16ffff5a772a288fc7c1972abb582c/log.txt

Everything builds fine if `` is empty (in `Example.xaml`):

```xml
delete these contents of "Node" to make it compile
```

### Reproduction Steps

https://github.com/matthew-a-thomas/dotnet-error-mc1000/tree/7cb13040dd16ffff5a772a288fc7c1972abb582c

`dotnet build` fails with this error.

`dotnet build` succeeds if `Example.xaml` is changed to:

```xml

```

### Expected behavior

Successful build

### Actual behavior

Error

### Regression?

Not sure. I tried uninstalling .NET 8 SDK and I still get the error when building with .NET 7 SDK
### Known Workarounds

_No response_

### Configuration

> dotnet --version
> 8.0.100-rc.2.23502.2

> dotnet --version
> 8.0.100-rc.1.23463.5

> dotnet --version
> 7.0.403

(Happens with all three of these SDKs)

Windows 11

x64

### Other information

_No response_