JSON:API in Drupal core 8.8.x introduced a way of normalizing reference fields by treating them as relationships (see #3036285: Add a \JsonApiResource\Relationship object to carry relationship data, metadata and a link collection. → and associated change record https://www.drupal.org/node/3084710 → ) instead of fields.
Thus reference fields are no longer seen as "fields" when normalized and are managed by a new RelationshipNormalizer which is not decorated by jsonapi_extra.
As a result, any field enhancer associated to a reference field won't be picked up and won't work.
Fixed
3.0
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Hi,
Just updating the patch #10 to support latest version 8.x-3.26,
Add : array|bool|string|int|float|null|\ArrayObject to the normalize function
other than no changes made.
Thanks.
Ignore the patch #23, use the latest one #25.