'CSharpDeclareAsNullableCodeFixProvider' encountered an error and has been disabled

[TessenR]

Version Used:

Microsoft Visual Studio Professional 2019 Preview
Version 16.7.0 Preview 5.0
VisualStudio.16.Preview/16.7.0-pre.5.0+30317.65
Microsoft .NET Framework
Version 4.8.03752

Steps to Reproduce:

Paste the following code in VS, expand the bulb while caret is on null in t.Item1 = null;

#nullable enable
class Program
{
  static void F1<T>((T, T?) t) where T : class
  {
    if (t.Item2 == null) return;
    t.Item1 = null;
    
    var (a, b) = t;
  }
}

Expected Behavior:
No exceptions I guess

Actual Behavior:

System.IndexOutOfRangeException : Index was outside the bounds of the array.
   at Microsoft.CodeAnalysis.CSharp.CodeFixes.DeclareAsNullable.CSharpDeclareAsNullableCodeFixProvider.TryGetDeclarationTypeToFix(SemanticModel model,SyntaxNode node)
   at async Microsoft.CodeAnalysis.CSharp.CodeFixes.DeclareAsNullable.CSharpDeclareAsNullableCodeFixProvider.RegisterCodeFixesAsync(<Unknown Parameters>)
   at async Microsoft.CodeAnalysis.CodeFixes.CodeFixService.GetCodeFixesAsync(<Unknown Parameters>)
   at async Microsoft.CodeAnalysis.Extensions.IExtensionManagerExtensions.PerformFunctionAsync[T](<Unknown Parameters>)
   at Microsoft.VisualStudio.Telemetry.WindowsErrorReporting.WatsonReport.GetClrWatsonExceptionInfo(Exception exceptionObject)

[nstepanets]

I am having a similar problem on Microsoft Visual Studio Community 2022 (64-bit), Version 17.3.5
Target framework: .NET 6.0
System.IndexOutOfRangeException : Index was outside the bounds of the array. at Microsoft.CodeAnalysis.CSharp.CodeFixes.DeclareAsNullable.CSharpDeclareAsNullableCodeFixProvider.TryGetDeclarationTypeToFix(SemanticModel model,SyntaxNode node) at async Microsoft.CodeAnalysis.CSharp.CodeFixes.DeclareAsNullable.CSharpDeclareAsNullableCodeFixProvider.RegisterCodeFixesAsync(<Unknown Parameters>) at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at async Microsoft.CodeAnalysis.CodeFixes.CodeFixService.GetCodeFixesAsync(<Unknown Parameters>) at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at async Microsoft.CodeAnalysis.Extensions.IExtensionManagerExtensions.PerformFunctionAsync[T](<Unknown Parameters>)