Theme palette color not showing on buttons in Gmail

[pixel21]

Steps to Reproduce

1. Go to Sensei -> Settings -> Emails
2. Click on any of the email template to edit it
3. Insert or change the button background to any color from the theme palette

4. Sign up or purchase a course and open the email in Gmail

What I Expected

I expected the button to show in the same color that I selected in the email editor

What Happened Instead

The email in Gmail looks like this

The button shows up with a transparent background.

PHP / WordPress / Sensei LMS version

PHP - 8.3
WordPress - 6.8.3
Theme - Twentytwentyfive
Sensei LMS version - 4.24.5

Browser / OS version

Chrome 140.0.7339.134 on Mac Sequoia 15.6.1

Context / Source

Once I disable the theme palette from appearing in the button background color choice and select a custom color, it shows up fine in Gmail

Here's the code that I used to disable the theme palette from sensei email template

function twentytwentyfive_remove_theme_colors_sensei_email( $settings, $context ) {
    if ( ! isset( $context->post ) || 'sensei_email' !== $context->post->post_type ) {
        return $settings;
    }

    if ( isset( $settings['color']['palette']['theme'] ) ) {
        unset( $settings['color']['palette']['theme'] );
    }

    if ( isset( $settings['__experimentalFeatures']['color']['palette']['theme'] ) ) {
        unset( $settings['__experimentalFeatures']['color']['palette']['theme'] );
    }

    return $settings;
}
add_filter( 'block_editor_settings_all', 'twentytwentyfive_remove_theme_colors_sensei_email', 9, 2 );

There was an old PR to disable default palette which was causing a similar issue.