Problem with field type Text (formatted, long, with summary) and multiple

Hello,

I have a issue when I use a field of type Text (formatted, long, with summary) with an unlimited number of values.
I can't display the summery by clicking on the link 'Edit summary' because it is not displayed due to the multiple widget.

You can see the normal case in file widget simple and my cas in the other file.

Is there a way to display it without using child theme and hook (especialy with admin theme)?

Thank you.