I also get the same error. After activating the Editing Toolkit create or edit a post returns these errors.
Bellow is the error message the is shown after ‘Copy Error’.
I had to deactivate the plugin. Can this be fixed?
Thanks
TypeError: Cannot read property 'setOpenState' of null
at render (https://roundtbl.org/wp-content/plugins/full-site-editing/wpcom-block-editor-nux/dist/wpcom-block-editor-nux.js?ver=a31f2374725b217b853837e5e5b1763b:6:15560)
at we (https://roundtbl.org/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.13.1:84:293)
at zj (https://roundtbl.org/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.13.1:226:496)
at Th (https://roundtbl.org/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.13.1:152:223)
at tj (https://roundtbl.org/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.13.1:152:152)
at Te (https://roundtbl.org/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.13.1:146:151)
at https://roundtbl.org/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.13.1:61:68
at unstable_runWithPriority (https://roundtbl.org/wp-includes/js/dist/vendor/react.min.js?ver=16.13.1:25:260)
at Da (https://roundtbl.org/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.13.1:60:280)
at Pg (https://roundtbl.org/wp-includes/js/dist/vendor/react-dom.min.js?ver=16.13.1:61:14)