how to interpret body in bodyRoot

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In this tsp
```
op test(@bodyRoot body: {@body body: Test}): void;
```

is the body parameter Test or an anonymous model with a property named body whose type is Test?
the openapi3 emitter result shows the former

but the type graph shows the later?

it's a real case https://github.com/Azure/azure-rest-api-specs/blob/ca4b71ab0e3bb7e4c44b44bf4d84d9c51f7b8264/specification/workloads/Workloads.SAPVirtualInstance.Management/SAPCentralServerInstance.tsp#L61, and seems quite common as azure operation template uses bodyRoot here
https://github.com/Azure/typespec-azure/blob/main/packages/typespec-azure-resource-manager/lib/operations.tsp#L502

According to https://github.com/microsoft/typespec/issues/2868#issue-2110782074 it feels like the former is correct?