I’ve debugged through the code with the plugin editor. Somehow some search shortcode is executed on the menu page. I have no idea why, but something must be triggering it.
However the shortcode handler tried to quit, as it detected it’s on an incorrect page. But there was a bug present in the search code, which cleared the screen content before quitting, that’s why the half was missing. I’ve corrected that, and of course I’m putting this fix to the upcoming version as well.
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