fixed failing unit tests

Author: david-driscoll

src/Shared/SharedHandlerCollection.cs

@@ -193,11 +193,7 @@ private LspHandlerDescriptor GetDescriptor(string method, Type handlerType, IJso
             }
 
             var key = "default";
-            if (handler is ICanBeIdentifiedHandler identifiedHandler)
-            {
-                key = identifiedHandler.Id.ToString("N");
-            }
-            else if (handler is IRegistration<TextDocumentRegistrationOptions> handlerRegistration)
+            if (handler is IRegistration<TextDocumentRegistrationOptions> handlerRegistration)
             {
                 // Ensure we only do this check for the specific registartion type that was found
                 if (typeof(TextDocumentRegistrationOptions).GetTypeInfo().IsAssignableFrom(registrationType))
@@ -215,6 +211,11 @@ private LspHandlerDescriptor GetDescriptor(string method, Type handlerType, IJso
 
             if (string.IsNullOrWhiteSpace(key)) key = "default";
 
+            if (handler is ICanBeIdentifiedHandler identifiedHandler && identifiedHandler.Id != Guid.Empty)
+            {
+                key += ":" + identifiedHandler.Id.ToString("N");
+            }
+
             var requestProcessType =
                 options?.RequestProcessType ??
                 typeDescriptor?.RequestProcessType ??