Multiple sites departments with equal name

Multiple sites departments with equal name

I tried to add 2 sites to an account and used default settings for departments. After creation I have 2 departments named "General" which are belong to different sites. Now I try to edit the first department with no changes and just click Save button with success. Then I try to edit the second department the same way but after I click Save button I got an error which says that the department with this name already exists. What's wrong with this? Moreover, can't sites have each their departments with the same names, say, Sales?