Error: Cannot read properties of undefined (reading 'items') when creating a return via Store API

[Dev-Abdullah-H]

Bug report

Describe the bug

When attempting to create a return using the store API (http://localhost:9000/store/return), the request results in an unknown error. The response received is {"code": "unknown_error", "type": "unknown_error", "message": "An unknown error occurred."}. The Medusa admin terminal logs an error indicating that it cannot read properties of undefined, specifically items.

System information

Medusa version (including plugins): preview / v2.0.10
Node.js version: 20.17.0
Database: Postgres 16.4

Steps to reproduce the behavior

1. Make a POST request to http://localhost:9000/store/return

curl --location 'http://localhost:9000/store/return' \
--header 'Content-Type: application/json' \
--header 'x-publishable-api-key: pk_10150e6c0669af1e359b2**********************' \
--header 'Cookie: connect.sid=s%3AnUQqUNMH7yU3zkJlS9JPIZ7m_r2ihh2z.WZh9aa****************' \
--data '{
    "order_id": "order_01J8Q1Y7HE2VF55E7NQ9PRPPP9",
    "items" : [{
        "id": "ordli_01J8Q1Y7HFZE1WQ8MEE4K7CERV",
        "quantity": 1,
        "reason_id": "rr_01J8B1A06M6KJ0GBGMY11XBZDA"
    }],
    "return_shipping": {
        "option_id": "so_01J6RTYHDNVRZ7EYMH9KEKCMJZ"
    }
}'

2. Observe the response:

{
    "code": "unknown_error",
    "type": "unknown_error",
    "message": "An unknown error occurred."
}

3. Check the Medusa admin terminal for errors:

{
  message: "Cannot read properties of undefined (reading 'items')",
  name: 'TypeError',
  stack: "TypeError: Cannot read properties of undefined (reading 'items')\n" +
    '    at Object.<anonymous> (E:\\Work\\medusa-poc-0824\\medusa-admin\\node_modules\\@medusajs\\core-flows\\dist\\order\\workflows\\return\\create-complete-return.js:119:16)\n' +
    '    at Object.invoke (E:\\Work\\medusa-poc-0824\\medusa-admin\\node_modules\\@medusajs\\workflows-sdk\\src\\utils\\composer\\helpers\\create-step-handler.ts:58:67)\n' +       
    '    at processTicksAndRejections (node:internal/process/task_queues:95:5)\n' +
    '    at async DistributedTransaction.handler (E:\\Work\\medusa-poc-0824\\medusa-admin\\node_modules\\@medusajs\\orchestration\\src\\workflow\\workflow-manager.ts:214:16)\n' +  
    '    at async stepHandler (E:\\Work\\medusa-poc-0824\\medusa-admin\\node_modules\\@medusajs\\orchestration\\src\\transaction\\transaction-orchestrator.ts:788:20)\n' +
    '    at async Promise.allSettled (index 0)\n' +
    '    at async promiseAll (E:\\Work\\medusa-poc-0824\\medusa-admin\\node_modules\\@medusajs\\utils\\src\\common\\promise-all.ts:23:18)\n' +
    '    at async TransactionOrchestrator.executeNext (E:\\Work\\medusa-poc-0824\\medusa-admin\\node_modules\\@medusajs\\orchestration\\src\\transaction\\transaction-orchestrator.ts:920:7)\n' +
    '    at async executeNext (E:\\Work\\medusa-poc-0824\\medusa-admin\\node_modules\\@medusajs\\orchestration\\src\\transaction\\transaction-orchestrator.ts:968:14)\n' +
    '    at async TransactionOrchestrator.resume (E:\\Work\\medusa-poc-0824\\medusa-admin\\node_modules\\@medusajs\\orchestration\\src\\transaction\\transaction-orchestrator.ts:983:5)'     
}

Expected behavior

I expect the return creation process to complete successfully and return a confirmation response.

Screenshots

Additional context

I attempted to console log the input in create-complete-return.js at line 118, and the result is undefined, which indicates that the data structure being passed may not be correctly formatted or that the required data is not being retrieved properly.