The internal components of the animation were not rendered

1. I used animation components in the animation component, but the internal components were not rendered
2. Internal animation components width I use percentage. If I don't use percentages, it can render successfully
3. If I don't use debug(self. width) in init, internal components won't render, see slintpad, code from @jui/drawer/drawer_left.slint
4. But if I use debug(self. width) in init, internal components render success, see slintpad
5. Difference code(On line 79 of slintpad)

// render success
export component AL inherits DrawerLeft {
    width: 100%;
    show: true;
    background: red;

    init => {
       debug(self.width)
    }
}

// won't render
export component AL inherits DrawerLeft {
    width: 100%;
    show: true;
    background: red;

    init => {
       // debug(self.width)
    }
}