Bug Report Checklist

• [- ] Have you provided a full/minimal spec to reproduce the issue?
• [ -] Have you validated the input using an OpenAPI validator?
• [ X] Have you tested with the latest master to confirm the issue still exists?
• [ X] Have you searched for related issues/PRs?
• [ X] What's the actual output vs expected output?
• [- ] [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

AfterOperationDefaultImplementation tries to use format param {3} rather than {2}, which causes
System.FormatException: Index (zero based) must be greater than or equal to zero and less than the size of the argument list.

openapi-generator version

7.17.0

OpenAPI declaration file content or url

N/A

Generation Details

CSharp generichost

Steps to reproduce

Any c# api using this tempate will fail at runtime

Related issues/PRs

NA

Suggest a fix

replace {3} with {2}