WCF Client (.net8.0 Win form Exe) Call will Hung if Sync Method is Invoked before Invoking any Async Method

**Repro:**
1. Create WCF service with NetTCP binding with runtime as .Net framework 4.8
2. Create WCF client (Win forms exe) using WCF client packages 8.1 and runtime as .Net 8.0


**Expected Results:**
Both operations should return irrespective of the sequence of requests

**Actual Results:**
Scenario 1: If Sync call (button2_Click) is Invoked first, call never returns
Scenario 2: If Async call (button1_Click) is Invoked first and then Sync call (button_Click) is invoked, results are as expected
Scenario 3: Sync calls works fine provided async call was invoked at least once

No issue if client is running on .Net framework.
No issue if client is a console application on .Net 8.0

@mconnew , How to justify the above behavior with WCF client packages on .Net 8.0 ?
Your clarifications will help me to assess the feasibility of WCF client codebase migration to .Net 8.0