Ok I found pfff...
My "Parent" had as parent, "Parent". So I removed it thanks to http://.../admin/manage/categories/* urls...
Would be great to be forbidden or something logged 😉
Click reload don't work
maybe some plugin lost
@Dk what doesn't work? Clicking the reload button on the top right doesn't reload your instance?
@pichalite yes, restart is ok, reload not work
@pichalite fixed, i delete node_modules and rebuild