Use same resource instance for operation processing and generating ID trees

This issue is a (choose one):

Feature request

Checklist before submitting:

• I've searched for an existing issue.
• I've asked my question on Gitter and have not received a satisfactory answer.
• I've included a complete bug report template. This step helps us and allows us to see the bug without trying to reproduce the problem from your description. It helps you because you will frequently detect if it's a problem specific to your project.
• The feature I'm asking for is compliant with the JSON:API spec.

Description

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Features:

In previous versions, a single resource instance was used for performing the operation and generating the response. Now these parts of the request handling are split into distinct steps which each use their own resource instances. As a result, any instance variables stored on the resource during the operation are not present when generating the response.

Any resource instances that are created for the operation processing should be used for the response generation as well.

Es werden keine Dateien oder Tests genannt. Beginne damit, die Pfade zur Anfrageverarbeitung für die Verarbeitung von Operationen und die Generierung von Antworten nachzuverfolgen, und vergleiche anschließend, an welchen Stellen Ressourceninstanzen erstellt werden. Fertig ist die Änderung, wenn die während der Operationen verwendeten Ressourceninstanzen auch zur Generierung von Antworten verwendet werden und dabei die während der Operation gesetzten Instanzvariablen erhalten bleiben.