I have been looking for a way to block people from using saved toolbars, mob spawn eggs, and other things in creative and this plugin works. Please add it, as this will open new possibilities for people on minehut to create plots servers where people can build whatever they want and show it off to their friends!
CreativeItemControl (Updated 1.16 Version) - https://www.spigotmc.org/resources/creativeitemcontrol-with-saved-toolbar-support-for-1-12-and-above.30778/