I’m use a function to manipulate the Woocommerce checkout fields

function custom_override_checkout_fields( $fields )
{
    // Text
    $fields['billing']['billing_address_1']['placeholder'] = 'Address line 1';
    $fields['billing']['billing_address_1']['label'] = 'Address';
    $fields['billing']['billing_address_2']['placeholder'] = 'Address line 2';
    $fields['billing']['billing_city']['placeholder'] = 'TEST';
}

add_filter( 'woocommerce_checkout_fields' , 'custom_override_checkout_fields',99 );

which is mostly working (for setting properties of most fields, classes etc.

for the snippet above, the billing_city placeholder is working but the billing_address_1 and billing_address_2 placeholder and label aren’t.

What am I missing here?