The TagifyEntityReferenceAutocompleteWidget doesn't add entity object to element data set. For example, EntityReferenceAutocompleteWidget does it like that:
public function formElement(FieldItemListInterface $items, $delta, array $element, array &$form, FormStateInterface $form_state) {
...
$entity = $items->getEntity();
// Append the entity if it is already created.
if (!$entity->isNew()) {
$selection_settings['entity'] = $entity;
}
...
Proposed solution: Add entity object to EntityReferenceAutocompleteWidget as well, so entity can be fetched in other places, like that:
$configuration = $this->getConfiguration();
$channel = $configuration['entity'];
For example, it can be useful in custom entity reference selection plugin which can be attached to field with Tagify widget.
Active
1.2
Code
It is working as expected.
Thank you very much @oleksandr.s to report and fix this bug.
It will be included in release 1.2.29