I have similar issues again. This issues only happen, if the option “Activate Administrator Menu Access module” is activated in the network admin settings AND the editor’s admin menu is restricted using “Block menu items” > “Not Selected”. If I deactivate this option and the editor’s admin menu is not restricted or if I do it with “Block menu items” > “Selected”, it all works fine.
-> Same as above in my first post.
-> The media library seams not to be affected this time.
Now, the editor gets forwarded to the dashboard when using the wordpress button to create an new page or clicking on the trash.