This is related to Question closed as a duplicate, link points to question closed as a duplicate, but it is more problematic.
The question (Q) Prove that quotient topology $\mathbb{R}/\sim$ is the circle topology. was closed as a duplicate of this question (Q') which (together with its answer) was deleted later for the reason that it needs details or clarity.
In my opinion this must not happen. If question (Q') is deleted and does not point to another question which is still open, the original question (Q) which was closed as a duplicate of (Q') should be reopened.
Does this make sense? If yes, would it worth to do this automatically by a new software feature?
