Missing ICLRRuntimeInfo::GetInterface return value documentation (and explanation)

The list of possible return values for ICLRRuntimeInfo::GetInterface misses HOST_E_INVALIDOPERATION.

This happens (according to what I can observe) when GetInterface is called with argument CLSID_CorRuntimeHost, if it was previously called with CLSID_CLRRuntimeHost as in the example shown below. The problem manifests with .net v4.0.30319 only on x64 (it was noticed when porting code from x86 which worked ok). I cannot tell whether this is expected behavior (to be documented) or an implementation error.

void* start_clr()
{

HRESULT hr;
ICLRMetaHost *pMetaHost = NULL;
ICLRRuntimeInfo *pRuntimeInfo = NULL;
ICLRRuntimeHost *pClrRuntimeHost = NULL;
ICorRuntimeHost *pCorRuntimeHost = NULL;

// build runtime
if (CLRCreateInstance(CLSID_CLRMetaHost, IID_PPV_ARGS(&pMetaHost)) != S_OK) {
printf("[x] Error: CLRCreateInstance(..)\n");
return NULL;
}

if (pMetaHost->GetRuntime(L"v4.0.30319", IID_PPV_ARGS(&pRuntimeInfo)) != S_OK) {
printf("[x] Error: GetRuntime(..)\n");
return NULL;
}

if (pRuntimeInfo->GetInterface(CLSID_CLRRuntimeHost, IID_PPV_ARGS(&pClrRuntimeHost)) != S_OK) {
printf("[x] Error: GetInterface CLR(..)\n");
return NULL;
}

if (pRuntimeInfo->GetInterface(CLSID_CorRuntimeHost, IID_PPV_ARGS(&pCorRuntimeHost)) != S_OK) {
printf("[x] Error: GetInterface Cor(..)\n");
return NULL;
}
// start runtime
if (pClrRuntimeHost->Start() != S_OK) {
printf("[x] Error: Start(..)\n");
return NULL;
}

// start runtime
if (pClrRuntimeHost->Stop() != S_OK) {
printf("[x] Error: Stop(..)\n");
return NULL;
}

printf("success!\n");
return 0;

}

---
#### Document Details

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* ID: 06d39eba-8eea-4a32-d904-89f055935d11
* Version Independent ID: 51425d93-882c-d44a-1000-4bf7b34edfe4
* Content: [ICLRMetaHost::GetRuntime Method](https://docs.microsoft.com/en-us/dotnet/framework/unmanaged-api/hosting/iclrmetahost-getruntime-method)
* Content Source: [docs/framework/unmanaged-api/hosting/iclrmetahost-getruntime-method.md](https://github.com/dotnet/docs/blob/main/docs/framework/unmanaged-api/hosting/iclrmetahost-getruntime-method.md)
* Product: **dotnet-framework**
* GitHub Login: @jeffschwMSFT
* Microsoft Alias: **jeffschw**