When become_method is su, self._play_context.prompt is a function. Fixes #23689

(cherry picked from commit f82d95ae28)

lib/ansible/plugins/connection/__init__.py

@@ -260,6 +260,8 @@ class ConnectionBase(with_metaclass(ABCMeta, object)):
             if not b_lines:
                 return False
             return b_lines[-1].strip().endswith(b_prompt) or b_lines[0].strip().endswith(b_prompt)
+        else:
+            return self._play_context.prompt(b_output)
 
     def check_incorrect_password(self, b_output):
         b_incorrect_password = to_bytes(gettext.dgettext(self._play_context.become_method, C.BECOME_ERROR_STRINGS[self._play_context.become_method]))