Disable youtube thumbnails

Hi,

I want to disable youtube thumbnail and iframe lazyload under certain condition (but keeping lazy load fo other images). If i use:

add_action( ‘wp’, ‘deactivate_rocket_lazyload_on_single’ );
function deactivate_rocket_lazyload_on_single() {
if ( is_single() && has_tag(‘mytag’)) {
add_filter( ‘do_rocket_lazyload_iframes’, ‘__return_false’ );
}
}

It won’t disable youtube thumbnails and thumbnail lazyload.

The only way is to disable Youtube Thumbnails in the plugin settings or to disable completly lazy loading with “do_rocket_lazyload”.

Any solution?