In a node add form with a entity reference field (Inline Entity Form - Complex widget), after a click on "Add new taxonomy term", the AJAX request had this following warning in the response and the request was broken :
Warning: Illegal string offset '_original_delta' in /app/web/core/lib/Drupal/Core/Field/WidgetBase.php on line 372
In the extractFormValues from WidgetBase.php, the _original_delta is added without checking the $value type.
Add a type checking is_array on the $value before trying to add a key / value.
Needs work
11.0 🔥
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The change is currently missing an automated test that fails when run with the original code, and succeeds when the bug has been fixed.
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As a bug this will need a test case.