.Net: Bug: Semantic Kernel Orchestration: ReasoningEffort setting becomes lost when invoking

[Hargravejason]

Describe the bug
When involving orchestration, HandOff in my example, ReasoningEffort setting is lost.

To Reproduce
Steps to reproduce the behavior:

1. Create agent with GPT 5.4 and assign ReasoningEffort as "high"
2. Create HandOff orchestration using created agent from step 1
3. Invoke orchestration
4. Observe HTTP request sent, reasoning_effort field is missing

Expected behavior
When using orchestration, I would expect to maintain reasoning level set on the agent, and that it is not lost during orchestration processing.

Screenshots
Agent HTTP request without orchestration:

Agent HTTP request with orchestration:

Platform

• Language: C#
• Source: 1.75.0
• AI model: gpt-5.4-mini (version:2026-03-17)
• IDE: Visual Studio 2026 April Release
• OS: Windows 11

Additional context
See attached sample code.

Program.txt