In the past, I occasionally cannot inspect variable values and issue goes away after I stop/start the debugger, but it has become permanent in the last 1 hour or so... this is what I could find in the logs.
Unhandled exception. System.MissingMethodException: Cannot dynamically create an instance of type 'Devsense.PHP.DocComments.Tags.ReturnTag'. Reason: No parameterless constructor defined.
at System.RuntimeType.ActivatorCache..ctor(RuntimeType )
at System.RuntimeType.CreateInstanceDefaultCtor(Boolean , Boolean )
at System.Activator.CreateInstance(Type , Boolean , Boolean )
at System.Activator.CreateInstance(Type , Boolean )
at System.Activator.CreateInstance(Type )
at Devsense.PHP.DocComments.Catalog.DocTagsCatalog.Create(String )
at Devsense.PHP.DocComments.Parser.DocParser.Parse(String , Int32 , NamingContext , String& , IDocEntry& )
at Devsense.PHP.DocComments.DocBlock.EnsureParsed()
at Devsense.PHP.DocComments.DocBlock.get_Entries()
at Devsense.PHP.DocComments.DocBlock.GetEnumerator()
at Devsense.PHP.Ast.DocBlock.DocBlockExtensions.GetElementOfType[T](IDocBlock docblock)
at PHP.VisualStudio.Language.Nodes.Frameworks.PhpUnitFrameworkResolver.TestCasesCache.IsTestMethod(MethodDecl )
at PHP.VisualStudio.Language.Nodes.Frameworks.PhpUnitFrameworkResolver.TestCasesCache.GetNodes(IFileInfo )
at PHP.VisualStudio.Language.Nodes.Project.ProjectTablesCache`2.project_NodeUpdated(IFileInfo , String , ContainerUpdateFlags )
at PHP.VisualStudio.Language.Nodes.Project.ProjectTablesCache`2..ctor(IProjectContainer )
at PHP.VisualStudio.Language.Nodes.Frameworks.PhpUnitFrameworkResolver.TestCasesCache..ctor(IProjectContainer )
at PHP.VisualStudio.Language.Nodes.Frameworks.PhpUnitFrameworkResolver.PhpUnitFrameworks..ctor(IProject )
at PHP.VisualStudio.Language.Nodes.Frameworks.PhpUnitFrameworkResolver.Devsense.PHP.Nodes.Frameworks.IPhpFrameworkResolver.ResolveFrameworks(IProject )
at PHP.VisualStudio.Language.Nodes.Project.ProjectContainer.<ResolveBuiltinFrameworks>b__35_0(IPhpFrameworkResolver )
at System.Linq.Enumerable.SelectArrayIterator`2.MoveNext()
at System.Linq.Enumerable.WhereEnumerableIterator`1.ToArray()
at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 )
at PHP.VisualStudio.Language.Nodes.Project.ProjectContainer.get_FrameworkProviders()
at PHP.VisualStudio.Language.Nodes.Project.ProjectContainer.QueryReferences()
at PHP.VisualStudio.Language.Nodes.Project.ProjectContainer.EnsureReferences()
at PHP.VisualStudio.Language.Nodes.Project.ProjectContainer.get_References()
at PHP.VisualStudio.Language.Nodes.Project.ProjectTablesWithReferences.GetClass(QualifiedName )
at Devsense.PHP.ControlFlow.TypeRef.Helpers.ClassRefGraph.AddNode(QualifiedName )
at Devsense.PHP.ControlFlow.TypeRef.Helpers.ClassRefGraph.InitNode(ClassRefNode , ITableType )
at Devsense.PHP.ControlFlow.TypeRef.Helpers.ClassRefGraph.AddNode(QualifiedName )
at Devsense.PHP.ControlFlow.TypeRef.Helpers.ClassRefGraph.InitNode(ClassRefNode , ITableType )
at Devsense.PHP.ControlFlow.TypeRef.Helpers.ClassRefGraph.AddNode(QualifiedName )
at Devsense.PHP.ControlFlow.TypeRef.Helpers.ClassRefGraph.InitNode(ClassRefNode , ITableType )
at Devsense.PHP.ControlFlow.TypeRef.Helpers.ClassRefGraph.AddNode(QualifiedName )
at Devsense.PHP.ControlFlow.TypeRef.Helpers.ClassRefGraph.InitNode(ClassRefNode , ITableType )
at Devsense.PHP.ControlFlow.TypeRef.Helpers.ClassRefGraph.AddNode(QualifiedName )
at Devsense.LanguageServer.Utils.NodeUtils.ResolveBase(ProjectContainer project, QualifiedName className, Name methodName)
at Devsense.PHP.LanguageServer.Commands.PeekBaseImplementationCommand.Resolve(INodeInfo node)
at Devsense.PHP.LanguageServer.CodeLensProvider.CollectCodeLens(IFileInfo finfo)+MoveNext()
at Devsense.PHP.LanguageServer.JsonRpc.JsonHelper.WriteJsonValue(Utf8JsonWriter output, IEnumerable enumerable)
at Devsense.PHP.LanguageServer.JsonRpc.JsonHelper.WriteJsonValue[T](Utf8JsonWriter output, T data)
at Devsense.PHP.LanguageServer.JsonRpc.RpcResponse`1.Devsense.PHP.LanguageServer.JsonRpc.IJsonSerializable.Serialize(Utf8JsonWriter output)
at Devsense.PHP.LanguageServer.JsonRpc.JsonHelper.WriteJsonValue[T](Utf8JsonWriter output, T data)
at Devsense.PHP.LanguageServer.JsonRpc.CommonMessageWriter.SerializeAndSend[T](T data, Boolean log)
at Devsense.PHP.LanguageServer.JsonRpc.CommonMessageWriter.WriteResponse[T](RpcResponse`1 response)
at Devsense.PHP.LanguageServer.JsonRpc.CommonMessageWriter.WriteResultResponse[T](Object requestId, T result)
at Devsense.PHP.LanguageServer.PhpLanguageServer.ProcessRequest[TParam](RpcRequest request, Func`2 resultFactory)
at Devsense.PHP.LanguageServer.PhpLanguageServer.PollAsync()
at Devsense.PHP.LanguageServer.PhpLanguageServer.Devsense.PHP.LSP.Threading.IWorker.NextAsync()
at Devsense.PHP.LanguageServer.Threading.WorkerFactoryExtensions.RunAsync(IWorker worker, CancellationToken cancellation)
at Devsense.PHP.LanguageServer.Program.Main(String[] args)
at Devsense.PHP.LanguageServer.Program.<Main>(String[] args)
[Error - 7:52:49 AM] Connection to server got closed. Server will not be restarted.
[Error - 7:52:49 AM] Request textDocument/codeLens failed.
Error: Connection got disposed.