Call super in Formatter.close methods to ensure sync is reset

lib/rspec/core/formatters/base_text_formatter.rb

@@ -63,11 +63,11 @@ def seed(notification)
         #
         # @param _notification [NullNotification] (Ignored)
         def close(_notification)
-          return if output.closed?
-
-          output.puts
-
-          output.flush
+          unless output.closed?
+            output.puts
+            output.flush
+          end
+          super
         end
       end
     end

lib/rspec/core/formatters/json_formatter.rb

@@ -55,6 +55,7 @@ def seed(notification)
 
         def close(_notification)
           output.write @output_hash.to_json
+          super
         end
 
         def dump_profile(profile)