Hide Featured Image in AMP

Try this code:

add_filter( 'amp_post_template_data', 'xyz_amp_remove_featured_image' );

function xyz_amp_remove_featured_image( $data ) {
    $data['featured_image'] = false;
    return $data;
}

More info about the amp hooks here
https://amp-wp.org/documentation/how-the-plugin-works/classic-templates/

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