This lets you blacklist inventories created by other plugins using their InventoryHolder class name. This can be used e.g. if you encounter dupe bugs with GUIs, backpack plugins, etc.
It lets you blacklist the inventory holder class names by regex, for example the InteractiveChat GUI holder would be \Qcom.loohp.interactivechat.objectholders.ICInventoryHolder\E
See config.yml for more information. It also explains how you can find out the names so that you can blacklist them.