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@Howard
Yeah, it's either sealed or it's been blocked by debris. Either way, it requires a surveyor to get up there and figure it out, but they don't want to do that because it means doing some work. The feckless contractors aren't going to sort it, either, as they caused it in the first place. Their insurance should be being used to repair it properly, but again that would be work to make that happen....and who wants to do that?
Not sure about others - below us moved out and rents to other feckless people, the rest are rarely around and or feckless.
Might fit an anti-siphon valve to kitchen plumbing as a short term fix.