Bug editing list Items using webpart connections ,group by and inline editing

Hi Everyone. I came across a bug using out of the box features.

Let me explain well the details to reproduce the error. I used :

*2 Lists :

-List one : the consumer list with two columns : 

-Number column

-Choice column

-List two : The sender list with one column :

  -Lookup column to gets the number column on the consumer list

*A webpart Page

*2 listviewwebparts in the webpart page

*Connect webparts to filter by the lookup column/number column

*Add inline editing in the consumer webpart 

Till now everything works perfectly, inline editing works fine. Let's add some more view details :

*Add a group by in the view of the consumer webpart (group by the choice column)

=> Try to edit list items, you will notice that inside a group, inline editing is OK and inside another group it doesnt work!

If you get the same error, that would be nice to find where is the problem (I already found a similar bug and the problem was the sorting that needs to be in the same way for both connected webparts , ASC or DESC). But this one... ???