is this the country or the cups?
It's the country, although there is a slight error in the course here as the most common spelling adds another 'i' to become 'Tsieina', this will be corrected in the revised course.
The crockery is 'tsieni'
Did this spelling change get lost in the chaos?
No, we accept both at the moment.
I heard something like 'chay-na' for this. Is that a bug, or is it how it's actually pronounnced?
That is a correct pronunciation.
This question only accepting Tseina, others only accepting Tsieina