I thought that, but I emailed the airline and asked about what would happen if I missed the connection (due to lines at immigration, delayed baggage, or whatever reason) and got this reply:

Hello,
Thanks for your email. But please be noted that if the first flight is normal and you will not catch the next flight,
You should pay fees for date changing. And we can offer you a night free accommodation in Beijing if these two flights are issued within one ticket .


Best Regards

And in another email from the airline, I was told the MCT is 90 minutes.

Which makes it sound like I would be responsible for paying for the next flight.