Cannot access input element in partial with Stimulus (Rails)

Question

I have a normal Rails one to many (one project has many tasks) application that works perfectly fine. What doesn't work is accessing the value of an input field that's rendered in a partial with a Stimulus method that is not connect().

So I have a partial for tasks in which I have an input field called title.

When I do

connect() {
        console.log(this.titleTarget.value)
    }

I get the value of the title (which is obviously empty at the beginning), but when I try to access the value in another method via button click, it fails.

So I have a button in the parent form that triggers the method 'copy' when clicked. This also works perfectly when the method looks like this:

copy() {
        console.log('clicked')
    }

But it fails and throws an error message when I try to access the input field's value:

copy() {
        console.log(this.titleTarget.value)
    }

This gives me this:

stimulus.js:2855 Uncaught Error: Missing target element "title" for "project" controller

Everything is obviously connected correctly since I can get the input's value and click on the button to console log something, but they do not work together and I don't understand why.

Also, I'm honestly just playing around with Stimulus, so there is no practical reason behind any of it, I'm just confused.

Thanks!