Encapsulated custom events not working

[kcap]

I'm trying to encapsulate an custom event in Alpine.data () but it doesn't fire. It only fires if it is in the attribute:

["@custom-event.window"]() { ... }
does not work
<div @custom-event.window = "...">
works

https://codepen.io/bitard999/pen/LYjpoeW

[SimoTod]

You are not using x-bind, you are just declaring a property called @custom-event.window in x-data which is different from a directive