Placeholder of Roadmap planner macro is disappeared due to 404 error of Javascript.

If the multiple bars or lanes (about 30) are inserted into Roadmap Planner macro, http status code 400 bad request of javascript occurs with the entry point which created the placeholder (http://example.com/plugins/servlet/confluence/placeholder/macro-heading).
And the placeholder of the macro is disappeared. Please see road_1.png 404error.jpg.
May this error have a impact on 10000+ users' instance?