After seen an image on bilibili (1st image, I think it is not fake), I checked posted images which can also found in this thread (image 2-4, you need to really zoom in to check the details), and I believe that J36 has leading edge flaps that use same flexible skin hinge as the other contol surfaces. If it is real then it might shows the top inlet and the aircraft itself can work in a higher angle of attack than we expected? 

the 4th image shows the thiny slots when the leading edge flaps is retracted




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