A 28-year-old male patient undergoes an emergency laparotomy for a perforated duodenal ulcer at a rural hospital in Uttar Pradesh. Post-operatively, he develops a surgical site infection with Clostridium difficile. The hospital's central sterile supply department (CSSD) uses a low-temperature hydrogen peroxide gas plasma sterilizer for heat-sensitive endoscopic instruments. However, an audit reveals that the sterilizer's chamber was not properly vented after the sterilization cycle, and residual hydrogen peroxide vapor remained in the instrument packaging. The surgeon used the instruments without allowing adequate aeration time. Which property of hydrogen peroxide gas plasma sterilization was not respected, increasing the risk of tissue toxicity and instrument contamination?