Can confirm this was an error on the plugin side. I uploaded a new version 1.3.1 which is much more robust and handles Scene changes more gracefully. Therefore a menu open/close works now.
Please let me know if it works for you, and thanks for the bug report!









Those three plugins heavily influence the base mechanics of RPG Maker MZ, and are untested with this small plugin. Compatibility can't be guaranteed. I tested CGMZ core with this, works fine, but couldn't get the demo of MZ3D to run. A quick glance in the source code reveals heavy influence on the events...