Incorrect operation parameter nesting for body parameter with type array

Description

When the body parameter is an array (of primitives or objects, does not matter), template variables receive 2-level array instead of 1-level (operations.operation[0].allParams[0].items.items).
When the parameter is in query, this does not happen.
When the parameter is not array, this does not happen.
"swagger" JSON output is correct, debugOperations output is incorrect.

Swagger-codegen version

2.2.3, 2.3.0-SNAPSHOT

Swagger declaration file content or url

swagger: '2.0'
paths:
  /primitive:
    post:
      parameters:
        - name: body
          in: body
          schema:
            type: array
            items:
              type: string
      responses:
        '200':
          description: ''

Command line used for generation

java -DdebugOperations -jar modules/swagger-codegen-cli/target/swagger-codegen-cli.jar generate -l swagger -i source.yaml -o out-swagger/ >debugOperations.json

Steps to reproduce

generate, see debugOperations.json, path operations.operation[0].allParams[0].items.items

Related issues/PRs

Probably, #6098 #6190

Run the shown swagger-codegen CLI command with source.yaml and inspect debugOperations.json at operations.operation[0].allParams[0].items.items. Compare this structure with the correct swagger JSON output and the query/non-array cases; done means a body array exposes one items level rather than two in debugOperations.