I feel like I should have seen this discussed somewhere, but I have no memory of it.
If someone dies with no sons and his daughters inherit his fields, one of the daughters marries a convert, and then she dies and he dies with no children, what happens to the fields at Yovel?
Does it go back to the original owner's family? Does it become hefker every time? Does it permanently belong to the family of the first person who acquires it? Does it go to the kohanim like a hekdesh field that was redeemed by someone else or never redeemed?