when any object has multiple locations, while the header Age: does not reach the s-maxage: a location is served from caches, even if it was removed in backend.

test case:

• create any object
• add one more location
• open the second location in a frontend, non-legacy mode
• reload, to check that Age: is increasing
• in admin, remove second location
• in frontend, keep reloading
• object will be served until Age: >= s-maxage