I am seeing the same issue. I have confirmed the custom field exists in the "contact_custom_fields" API call response with "name": "points". I am providing a "cf:points" value in the Bulk JSON upload alongside fields like "first_name", "last_name" which are being updated. The "cf:points" field is not being set on the contact. The /contact/XXX does not list any custom fields associated with the contact and the "updated_at" field has not changed.
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