Subrequests: Assigning Paragraphs entity to node

Migrating a content type from D7 into a greenfield D8 app, so I’m using Subrequests and jsonapi modules. My first subrequest to create a simple Paragraph returns the new ID and it properly replaces my token in my node–person, until it gets wiped out at some point within the many calls to httpKernel->handle($ request) class. I’ve burned a few hours setting breakpoints to see how its losing the replaced Paragraph ID but I’ve not mastered the Symfony Http system.

I’ve tried adding an owner iid, attempted to derive a “meta” array for a target_revision_id from the drupal_internal_revision_id property but that returns a 500 error. Here’s a minimized code of the blueprint.

function bodyPerson($  person){$  data = ["data" =>       ['type' => 'node--person',        'attributes' =>         ['title' => 'ignored',         'status' =>"1",         'field_body' =>           ['value' => 'Highlights.',              'format' => 'full_html',              'summary' => ''],        'field_last_name' =>           'Walls'     'relationships'=>       [        'owner' => ['data' =>          ['type' => 'user--user',          'id' => '2061b881-d5ea-4daa-a006-616e47xxx']],        'field_title' =>['data' =>          ['type' => "paragraph--title",            'id' => "{{paragraph-title-1.body@$  .data.id}}"]            ]       ]]];       return $  data;      } 
     $  bodyp = json_encode(["data" => ['type' => 'paragraph--title',        'attributes' => ['field_department' => ['value' => "my dept 1a"]],        ['field_title' => ['value' => "my title 1a"]]]]       ); 
     $  blueprint = json_encode([['action' => 'create', 'requestId' =>    'paragraph-title-1', 'body' => $  bodyp, 'uri' => '/jsonapi/paragraph/title', 'headers' => $  headers], ['action' => 'create', "waitFor" => ["paragraph-title-1"], "requestId" => "person-test", 'headers' => $  headers, 'uri' => "/jsonapi/node/person", 'body' => $  bodyPer]]); 

Passing the $ blueprint and the two body blocks into curl returns the new Paragraphs object, passing it to the final POST subrequest. The result is an empty “data” array where the Paragraphs’ link should be.

            "field_title": {                 "data": [],                 "links": {                     "self": {                         "href": "\/jsonapi\/node\/person\/9ebcdd24-d8ee-428d-8770-1ad62eexx\/relationships\/field_title?resourceVersion=id%3A1045"                     },                     "related": {                         "href": "\/jsonapi\/node\/person\/9ebcdd24-d8ee-428d-8770-1ad62exx\/field_title?resourceVersion=id%3A1045"                     }                 }             } 

Subrequests is working for other subrequests in this body.