Transit after visa expires

Hello!
My residence permit expires on July 15th, Friday. Will it be considered that I overstay my entry permit if I fly out from Nanchang at 23:00 Friday night to Hong Kong with the transit in Xiamen ( second flight to Hong Kong the next day since I arrive at Xiamen at night)?

Also, my employer will apply for my new residence permit on Friday, but it'll be only ready in 20 days, can I still fly out with my old residence permit on 16th July ( will it be considered overstay if my new residence permit will be in process?) thank you!