In the present cases, the effects of cavity loss provide an additional factor when considering cavity-modified reaction rates -in the present ab initio case, the cavity loss coincide with the effects of the light-matter coupling strength which decreases the reaction yield. Overall, explicitly including cavity loss in realistic polaritonic dynamics is required for a rigorous and consistent comparison to experiment, where the cavity loss rates are substantial enough to cause dramatic effects on the population dynamics and subsequent photo-reaction pathways accessible to the system.