Not able to simpler quickedit when body field empty

I'll looking on that.

Is we realy need the quickedit button on the empty filed...? Because if the field is not visible on the node page, then why, how and where we need to show the quickedit button. @Yuri I didn't understand the use case.

Indeed, it is working as expected. If nothing is displayed, then you cannot expect to have simpler_quickedit.

However, you can use https://www.drupal.org/project/empty_fields → to display something which then can be quickedited. Hope it helps!