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.
- 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