Entity Reference Subfield Causes Error when Populated

Are you try dev version? Maybe it fixed

The issue still persists when using the dev version. We had no problem using v 1 of the module on Drupal 10.1. I attach also the full error backtrace in a file.

So strange. I use taxonomy every day and never have this problem.
I guess you are not selecting vocabulary in the field settings
could you debug in file (line 103)
modules/contrib/datafield/src/Plugin/DataField/FieldFormatter/EntityReferenceLabelFormatter.php
it must have $reference_type = 'taxonomy_term' and $entity_id = (your tid)

$reference_type = 'taxonomy_term' is correct. I have two references to taxonomy terms and a reference to a node in the data field, I get an error on each of them (depending on which of the subfields is filled in and called first).

The problem seems to be with $entity_id. The problem is likely in the code that passes $item to the function viewElements($item, $langcode) in EntityReferenceLabelFormatter.php. $item->value returns an object (that of the taxonomy term) instead of the tid/nid. (oddly, this is only the case when rendering the data field from the node itself, when I set the manage display to 'rendered entity' in a node that references a node of the content type using the data field causing the error, the table with the subfields renders correctly).

Do you have any idea why the parameter $item would not have an object with the expected structure? Thank you very much for your help so far.

@brejchova try the dev version it should be ok (it took me a lot of time but I can't reproduce this problem)

Thank you! The fix worked. I had also been debugging and adding this simple condition after line 66 also worked:

if (!is_string($entity_id)) {
  $entity_id = $entity_id->id();
}

However, some edits in src/Plugin/DataField/FieldWidget/EntityReferenceAutocompleteWidget.php cause a different error when editing content:

TypeError: trim(): Argument #1 ($string) must be of type string, Drupal\taxonomy\Entity\Term given in trim() (line 82 of /var/www/html/drupal/web/modules/contrib/datafield/src/Plugin/DataField/FieldWidget/EntityReferenceAutocompleteWidget.php).

Wrapping the if block starting at line 82 of EntityReferenceAutocompleteWidget.php in an elfis block with the condition is_string($element["#default_value"]) fixed it.

Automatically closed - issue fixed for 2 weeks with no activity.