Improvements to how the inventory permissions are resolved internally. Players are now able to open inventories shown to them even if they only have access to the chat placeholder (showitem.chat.inv) without requiring the permissions to the /showinv command. (Which is run with a unique ID per placeholder when clicking on it) Existing setups that only allow the /showinv command are not be affected by this and will continue working like before.
Fixed that commands show up in the command suggestions even if the player didn't have permission for them by properly defining their permissions via the plugin.yml