Edition mode.
I have a multi-typed content which contains some tabs with the same name, the tabs appears twice.
The second tabs are empty.
(It seems to be general to fieldsets (tab or fieldset type))
This bug is there in 4.3M7 but wasn't in 4.2.
CMS-10140 Empty fieldsets (groups) should not be ignored when getting the model of a content type
CMS-10353 Content view : Merge tabs with same name