Berlin - Beijing - Hong Kong - Yangon, Myanmar - Chengdu - Berlin

Hello there!
I am a German citizen flying to Asia for holidays. I arrive to BJ for a day, then the next day fly to my next destination. It seems that I dont need a visa according to the 72 hour exemption. Then before heading back to Berlin two weeks later I am visiting Chengdu for two days and flying back from there. Chengdu is also a part of the visa exemption cities. So I guess I dont need a visa at all?
Or would I have problems because I entered China twice within some weeks?
Thank you in advance!