Many chairs are missing IO inputs, for example, the fancy chair has no “OnLeave”, the Victorian chair has no inputs.
Notes / Media
I feel like a lot of these problems could have been avoided if all the different seat types inherted from a common parent class
They do. Individual items can add/remove settings though in their metadata.
Edit: Looks like all seats do not have an “OnLeave”.
This is now fixed in the next update.