I travel to China for work 4-5 times a year, and I've always managed to get some bits and pieces done in the game. I was here a month ago and I could still catch things from my stack, and do my daily research task etc, but I just arrived here again today and I've opened my game and my research tabs are just blank. Nothing loading in the daily task and stack screen, my special research tab not loading either and the tab on the left with the GBL research and Go Pass stuff is blank as well.
So, the only things I can still do is open gifts and hatch eggs (through adventure sync), catch a Scatterbug through pinning gifts, and feed my buddy and get some buddy hearts.
Edit: I just did a GBL battle and my GBL research progressed (I got the notification) but I just can't access the actual research.