I have this plugin:

add_action( 'woocommerce_update_product', 'update_on_product_save', 1000, 1 );

function update_on_product_save( $product_id ) {
    do somthing
}

I was expecting the hook to execute after I press the product update button. This works, but only after the second update is clicked. In the first update, nothing happens, then after backend reload I click it again and it’s executed.

Any ideas on what to look for so it will be executed on the first update?