Defaults not working in Customizer with textarea

Hi there,

I’m currently experiencing an issue with the default setting when adding a textarea to the customizer. To add the setting, I use the following code with a default of ‘Copyright.” set:

$wp_customize->add_setting( 'copyright_text' , array(
    'default'           => esc_html__( 'Copyright.', 'themename' ),
    'type'              => 'theme_mod',
    'capability'        => 'edit_theme_options',
    'sanitize_callback' => 'sanitize_textarea_field',
) );

To add the control, I use the following code:

$wp_customize->add_control( 'copyright_text_control', array(
    'label'             => esc_html__( 'Copyright Text', 'themename' ),
    'description'       => esc_html__( 'Insert copyright text.', 'themename' ),
    'section'           => 'custom_footer_settings',
    'settings'          => 'copyright_text',
    'priority'          => 20,
    'type'              => 'textarea',
) );

Then to call it on the front end, I use the following code:

<?php echo get_theme_mod( 'copyright_text', 'Copyright Test' ); ?>

Every thing works as expected, except the default text. If I enter text in the textarea and click Publish, the text appears on the front end of the site, but the default text won’t.

My understanding is this:

'default' => esc_html__( 'Copyright.', 'themename' ), – This is what is displayed in the Customizer panel when it loads (if no custom text has been set).

<?php echo get_theme_mod( 'copyright_text', 'Copyright Test' ); ?> – The ‘Copyright Text’ text is what is displayed on the front end (if no custom text has been set).

I tested this exact code with just a text field (not the textarea) and every thing worked, including the defaults. I just can not get the defaults to display in either the Customizer panel or the front end when using a textarea.

Do I need to do something different with the textarea?