Hi Ksusha Zhegolko, 
are you sure about this change from admin_level=6 to admin_level=8. I do understand your point, but since these are city districts of the Toshkent, they should be in the same "rank" as other districts in Uzbekistan https://en.wikipedia.org/wiki/Subdivisions_of_Uzbekistan . Or is there special district for the Toshkent, because currently it looks like no admin2  level exist in the area of the capital