Yang–Li's conjecture on meromorphic solutions of a polynomial differential equation

Let $P_1$, $P_2$ and $P_3$ be non-zero polynomials. Consider the differential equation

$$P_1f^2+P_2(f^{(1)})^2=P_3.$$

Yang–Li's conjecture. The equation has no transcendental meromorphic solution when $P_1/P_3$ is a non-zero constant and $P_2/P_3$ is not the square of any rational function.

This conjecture concerns the existence of transcendental meromorphic solutions for a first-order nonlinear differential equation with polynomial coefficients. The supplied text gives no evidence that the conjecture has been resolved.