delete() does not remove resources imported from YAML

[buzanits]

I can create and update resources with

$x = $cluster->fromYaml($code);
$x->createOrUpdate();

But when doing

$x = $cluster->fromYaml($code);
$x->delete();

with the same $code the resources do not get deleted. Deleting works when I do kubectl delete -f code.yaml having the content of $code in the code.yaml.