TYPO3 Core

Here is the problem:

I have a be_group record which has the title "Contributeurs".
I wanted to rename it "Editeurs", so I changed the value of the field Grouptitle.

But then I tried to change back the name by re-editing the group and changing grouptitle. When I clicked "Save", the title didn't change.

To set the grouptitle back I had to save it with value "Contributeurs0" and then rename it to "Contributeurs".

(issue imported from #M8047)