Update to beta6 and images not shown

I update to 2.2.0.beta6 and found images uploaded a month ago will not shown.

You see, that photo was uploaded on 11/24, it shows incorrectly.

This photo was uploaded 5 days ago and it shows perfectly good.
I rebuild Discourse but this problem remains. Hope someone find the reason and solve this problem.

What is the url of the broken link? Good link?

oops, this problem is caused by hostname. A month ago I used “qinyujie.xyz” as my hostname, but I abandon that hostname later because in China we should put on records in the public security bureau and that needs a lot of time.
thanks Sam. Using discourse remap I soloved this problem.