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In this paper, we investigate the contributions of hard spectator scatteringand annihilation in $B\to PV$ decays within the QCD factorization framework.With available experimental data on $B\to \pi K^{\ast}$, $\rho K$, $\pi \rho$and $K\phi$ decays, comprehensive $\chi^2$ analyses of the parameters$X_{A,H}^{i,f}({\rho}_{A,H}^{i,f},{\phi}_{A,H}^{i,f})$ are performed, where$X_A^f$ ($X_A^i$) and $X_H$ are used to parameterize the endpoint divergencesof the (non)factorizable annihilation and hard spectator scattering amplitudes,respectively. Based on $\chi^2$ analyses, it is observed that (1) Thetopology-dependent parameterization scheme is feasible for $B\to PV$ decays;(2) At the current accuracy of experimental measurements and theoreticalevaluations, $X_H=X_A^i$ is allowed by $B\to PV$ decays, but $X_{H}\neq X_A^f$at $68%$ C. L.; (3) With the simplification $X_H=X_A^i$, parameters $X_A^f$ and$X_A^i$ should be treated individually. The above-described findings are verysimilar to those obtained from $B\to PP$ decays. Numerically, for $B\to PV$decays, we obtain $(\rho_{A,H}^i,\phi_{A,H}^i[^{\circ}])=(2.87^{+0.66}_{-1.95}, -145^{+14}_{-21})$ and $(\rho_A^f,\phi_A^f[^{\circ}]) =(0.91^{+0.12}_{-0.13}, -37^{+10}_{-9})$ at $68%$ C. L.. With the best-fitvalues, most of the theoretical results are in good agreement with theexperimental data within errors. However, significant corrections to thecolor-suppressed tree amplitude $\alpha_2$ related to a large $\rho_H$ resultin the wrong sign for $A^{dir}_{CP}(B^- \to \pi^0 K^{{\ast}-})$ compared withthe most recent BABAR data, which presents a new obstacle in solving "$\pi\pi$"and "$\pi K$" puzzles through $\alpha_2$. A crosscheck with measurements atBelle (or Belle II) and LHCb, which offer higher precision, is urgentlyexpected to confirm or refute such possible mismatch.

Constraints on hard spectator scattering and annihilation corrections in $B_{u,d}$ ${\to}$ $PV$ decays within QCD factorization