Menu title defined by class in plugin

public function getTitle() { //ok with superfish return $this->t('Modified title'); //superfish will not return string in this case while it is returned with Drupal core tools menu return [ '#markup' => $this->t('Modified title'), '#attached' => ['library' => ['my_module/library'],], ]; }

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Comment 14 days ago →
🇧🇪Belgium lobsterr
After my investigation of many classes which implement MenuLinkInterface

1) MenuLinkInterface expects string

/** * Returns the localized title to be shown for this link. * * @return string * The title of the menu link. */ public function getTitle();
2) by default menu links are passed through DefaultMenuLinkTreeManipulators class:

$new_tree[(50000 + $instance->getWeight()) . ' ' . $instance->getTitle() . ' ' . $instance->getPluginId()] = $tree[$key];

As you can see in the core nothing special is done with getTitle method result and just a simple string is expected and not array. As a result I get warining:

Warning: Array to string conversion in Drupal\Core\Menu\DefaultMenuLinkTreeManipulators->generateIndexAndSort() (line 245
From here I can conclude: yes, it works! because conversion of an array to string, but definitely it is not what expected. It is not a bug.