Override generate_blog_single_featured_image

Hi, I'm trying to override generate_blog_single_featured_image() in functions.php.

But it's causing a bit of trouble.

I've tried adding the following code:

add_action( 'init', 'remove_actions_parent_theme');

function remove_actions_parent_theme() {
	remove_action( 'generate_before_content', 'generate_blog_single_featured_image' );
	add_action( 'generate_before_content', 'custom_generate_blog_single_featured_image' );
};

but I just end up with 2 featured images, meaning it did not remove the action.