fix the error when mix-use the cache-show and help option

src/_pytest/config/__init__.py

@@ -1074,6 +1074,12 @@ class Config:
                 )
 
             raise
+        except PrintHelp:
+            self._parser._getparser().print_help()
+            sys.stdout.write(
+                "\nNOTE: displaying only minimal help due to UsageError.\n\n"
+            )
+            raise UsageError
 
         return self
 
@@ -1368,7 +1374,7 @@ class Config:
             self.args = args
             self.args_source = source
         except PrintHelp:
-            pass
+            raise
 
     def issue_config_time_warning(self, warning: Warning, stacklevel: int) -> None:
         """Issue and handle a warning during the "configure" stage.