Unstable unit test: BindingContextTests.BindingContext_Item_GetIListSourceDataSourceWithDataMemberReturningIListNull_ThrowsArgumentNullException
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Description
Related #11227
### Test
System.Windows.Forms.Tests.BindingContextTests.BindingContext_Item_GetIListSourceDataSourceWithDataMemberReturningIListNull_ThrowsArgumentNullException
### Issue description
The case failed in [dotnet-winforms CI](https://dev.azure.com/dnceng-public/public/_build?definitionId=76&_a=summary)
**Error Message:**
- **In X86 unit:**
- Assert.IsType() Failure: Value is null
Expected: typeof(System.Windows.Forms.PropertyManager)
Actual: null
**Stack trace:**
```
at System.Windows.Forms.Tests.BindingContextTests.BindingContext_Item_GetIListSourceDataSourceWithDataMemberReturningIListNull_ThrowsArgumentNullException() in /_/src/System.Windows.Forms/tests/UnitTests/System/Windows/Forms/BindingContextTests.cs:line 682
at System.RuntimeMethodHandle.InvokeMethod(Object target, Void** arguments, Signature sig, Boolean isConstructor)
at System.Reflection.MethodBaseInvoker.InterpretedInvoke_Method(Object obj, IntPtr* args)
at System.Reflection.MethodBaseInvoker.InvokeWithNoArgs(Object obj, BindingFlags invokeAttr)
```
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