Change plans during transfer 144 hours

Hello, I arrived yesterday in Shanghai from Frankfurt/Germany and came into country on 144hr transfer visa to leave on Sunday to Tokyo/Japan.

However, my plans has suddenly changed and I need to go back to Europe and booked tomorrow (Saturday's) flight to Frankfurt. Of course, cancelled my flight to Tokyo.

Won't I have any problems at immigration, that I was supposed to leave for Japan, but actually go back to my original airport?

Thank you!