The effect of magnetization pinning at corners on spin wave dynamics in a spin wave conduit of yttrium iron garnet is investigated by using micromagnetic simulation. The simulation results reveal that two-magnon scattering brought on by this magnetization pinning scatters spin waves in various directions, resulting in a more dispersed spin wave pattern in k space. The evolution patterns of spin waves suggest that spin waves modes resonate at different applied magnetic fields, and magnetization pinning-induced magnon scattering brings the resonance fields of spin wave modes closer together. In addition, this magnon scattering modifies the intensity of spin wave modes at resonance, by more than 40 percent, for example, though altering their relaxation rate. By lengthening spin wave conduits the effects of this magnetization pinning could be limited, which may improve the performance of spin wave conduits.