#2864680: Spec Compliance: JSON API's schema disallows duplicate resource identifiers. EntityReferenceItems which reference the same entity must have an "arity" → added an arity key to relationships returned by jsonapi to avoid an error when a reference field contains the same entity multiple times.
However, we have a similar problem when returning data about a specific field.
The previous fix only applies to ResourceIdentifier, but when querying a field, jsonapi returns normalized ResourceObject and those don't have an arity key.
/jsonapi/[entity_type]/[bundle]/[uuid]/[field_name] (real life example: /jsonapi/paragraph/carrousel/2f03a78f-1d0a-43e5-a6ee-6fb0fd8a90f7/field_images).A JSON:API response failed validation (see the logs for details). Please report this in the issue queue on drupal.org
(However /jsonapi/[entity_type]/[bundle]/[uuid] does not have the same error because there, the relationship has arity keys.)
jsonapi should add an arity key on duplicated ResourceObject objects.
The arity logic from ResourceIdentifier should probably be refactorized to be used by other classes.
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