This question already has an answer here:
Some accepted answers do not have a valid accept-vote in Votes table, even though the question owner still exists. Stack Overflow alone has over 2000 such answers. A recent example is Sub query for column name:
- The timeline says that the answer was unaccepted on July 3, 2014.
- However, it still has the green checkmark
- However, the checkmark does not show acceptance time on hover.
Is the answer accepted or not? Is it some kind of Schrödinger's acceptance?