Kotlin reflection: findAnnotation

I have the following data class:

data class Foo(@field:Password val password: String)

Why does Foo::password.annotations return an empty list? Also, Foo::password.findAnnotation<Password>() returns null.

The same happens when I use an instance of Foo:

Foo("")::password.annotations

Foo("")::password.findAnnotation<Password>()

However, this java variant works: Foo::password.javaField.getAnnotation(Password::class.java).

This is on kotlin version 1.3.10.

The docs don't give much information on the inner workings of findAnnotation.

https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.reflect/-k-property/index.html

fun <T : Annotation> KAnnotatedElement.findAnnotation(): T?

Returns an annotation of the given type on this element.

What am I missing here?

Thanks in advance!