  The slow-bond problem is a long-standing question about the minimal strength
$\epsilon_\mathrm{c}$ of a local defect with global effects on the
Kardar--Parisi--Zhang (KPZ) universality class. A consensus on the issue has
been delayed due to the discrepancy between various analytical predictions
claiming $\epsilon_\mathrm{c} = 0$ and numerical observations claiming
$\epsilon_\mathrm{c} > 0$. We revisit the problem via finite-size scaling
analyses of the slow-bond effects, which are tested for different boundary
conditions through extensive Monte Carlo simulations. Our results provide
evidence that the previously reported nonzero $\epsilon_\mathrm{c}$ is an
artifact of a crossover phenomenon, which logarithmically converges to zero as
the system size goes to infinity.
