Virtual Clemens conjecture for Calabi–Yau threefolds

For a Calabi–Yau threefold $X$, an isolated rational curve is a rational curve that is isolated in the relevant moduli space, and a smooth $(-1,-1)$ curve is a smooth rational curve with normal bundle isomorphic to $\mathcal{O}_{\mathbb{P}^1}(-1)\oplus\mathcal{O}_{\mathbb{P}^1}(-1)$. The curves are denoted by $C_i\subset X$.

Virtual Clemens conjecture. For the purpose of computing genus zero enumerative invariants on Calabi–Yau threefolds $X$, one may assume that there are only finitely many isolated rational curves $\{C_i\subset X\}$. Furthermore, $C_i$ are all smooth $(-1,-1)$ curves.

This folklore conjecture is used as a heuristic starting point for relating genus-zero Gopakumar–Vafa invariants to quantum $K$-invariants through a multiple-cover formula. The source does not state a resolution of the conjecture.