Update RunCommandSelector.cs

Author: jonathanpeppers

src/Cli/dotnet/Commands/Run/RunCommandSelector.cs

@@ -31,7 +31,6 @@ internal sealed class RunCommandSelector : IDisposable
 
     private ProjectCollection? _collection;
     private Microsoft.Build.Evaluation.Project? _project;
-    private ProjectInstance? _projectInstance;
 
     /// <summary>
     /// Gets whether the selector has a valid project that can be evaluated.
@@ -107,7 +106,6 @@ public void InvalidateGlobalProperties(Dictionary<string, string> updatedPropert
 
         // Dispose existing project to force re-evaluation
         _project = null;
-        _projectInstance = null;
         _collection?.Dispose();
         _collection = null;
         HasValidProject = false;
@@ -133,8 +131,7 @@ private bool OpenProjectIfNeeded([NotNullWhen(true)] out ProjectInstance? projec
                 loggers: null,
                 toolsetDefinitionLocations: ToolsetDefinitionLocations.Default);
             _project = _collection.LoadProject(_projectFilePath);
-            _projectInstance = _project.CreateProjectInstance();
-            projectInstance = _projectInstance;
+            projectInstance = _project.CreateProjectInstance();
             HasValidProject = true;
             return true;
         }