I have observed a few times that, when I suggest an edit and that edit is accepted by someone else, but they add a further edit, then they seem to duplicate my edit summary in their own edit. However, this is usually not accurate to their edit.
Example: revision 7 has the same edit summary as (my) revision 6.
Question (which is why I tagged this support): Is this just a default? Can the reviewer actually change the edit summary for their subsequent edit?