If mutiple bars or lanes(over 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).
We've raised the bug report CONF-37543 "Placeholder of Roadmap planner macro is disappeared due to 404 error of Javascript.".

We assume that the process which created the placeholder causes this error.
To fix this, do you have any idea which can reduce this processing load?