diff --git a/dlls/mf/sar.c b/dlls/mf/sar.c
index 6f1f1bd834e..e318576e80e 100644
--- a/dlls/mf/sar.c
+++ b/dlls/mf/sar.c
@@ -1479,11 +1479,10 @@ static HRESULT WINAPI audio_renderer_stream_type_handler_IsMediaTypeSupported(IM
     TRACE("%p, %p, %p.\n", iface, in_type, out_type);
 
     EnterCriticalSection(&renderer->cs);
-    hr = renderer->current_media_type && IMFMediaType_IsEqual(renderer->current_media_type, in_type, &flags) == S_OK ?
-            S_OK : MF_E_INVALIDMEDIATYPE;
+    hr = IMFMediaType_IsEqual(renderer->media_type, in_type, &flags);
     LeaveCriticalSection(&renderer->cs);
 
-    return hr;
+    return hr != S_OK ? MF_E_INVALIDMEDIATYPE : hr;
 }
 
 static HRESULT WINAPI audio_renderer_stream_type_handler_GetMediaTypeCount(IMFMediaTypeHandler *iface, DWORD *count)
diff --git a/dlls/mf/tests/mf.c b/dlls/mf/tests/mf.c
index 7dc325424a6..6699c1ca9d1 100644
--- a/dlls/mf/tests/mf.c
+++ b/dlls/mf/tests/mf.c
@@ -2831,7 +2831,7 @@ static void test_sar(void)
     IMFMediaSink *sink, *sink2;
     IMFStreamSink *stream_sink;
     IMFAttributes *attributes;
-    DWORD id, flags, count;
+    DWORD i, id, flags, count;
     IMFActivate *activate;
     MFCLOCK_STATE state;
     IMFClock *clock;
@@ -2839,6 +2839,7 @@ static void test_sar(void)
     HRESULT hr;
     GUID guid;
     BOOL mute;
+    int found;
 
     hr = CoInitialize(NULL);
     ok(hr == S_OK, "Failed to initialize, hr %#x.\n", hr);
@@ -2988,6 +2989,22 @@ todo_wine
     ok(hr == S_OK, "Failed to get type count, hr %#x.\n", hr);
     ok(!!count, "Unexpected type count %u.\n", count);
 
+    /* A number of same major/subtype entries are returned, with different degrees of finer format
+       details. Some incomplete types are not accepted, check that at least one of them is considered supported. */
+
+    for (i = 0, found = -1; i < count; ++i)
+    {
+        hr = IMFMediaTypeHandler_GetMediaTypeByIndex(handler, i, &mediatype);
+        ok(hr == S_OK, "Failed to get media type, hr %#x.\n", hr);
+
+        if (SUCCEEDED(IMFMediaTypeHandler_IsMediaTypeSupported(handler, mediatype, NULL)))
+            found = i;
+        IMFMediaType_Release(mediatype);
+
+        if (found != -1) break;
+    }
+    ok(found != -1, "Haven't found a supported type.\n");
+
     hr = IMFMediaTypeHandler_GetCurrentMediaType(handler, &mediatype);
     ok(hr == MF_E_NOT_INITIALIZED, "Unexpected hr %#x.\n", hr);
 
@@ -3005,16 +3022,16 @@ todo_wine
     hr = IMFMediaTypeHandler_SetCurrentMediaType(handler, mediatype);
     ok(hr == MF_E_INVALIDMEDIATYPE, "Unexpected hr %#x.\n", hr);
 
-    hr = IMFMediaTypeHandler_GetMediaTypeByIndex(handler, 0, &mediatype2);
+    hr = IMFMediaTypeHandler_GetMediaTypeByIndex(handler, found, &mediatype2);
     ok(hr == S_OK, "Failed to get media type, hr %#x.\n", hr);
 
-    hr = IMFMediaTypeHandler_GetMediaTypeByIndex(handler, 0, &mediatype3);
+    hr = IMFMediaTypeHandler_GetMediaTypeByIndex(handler, found, &mediatype3);
     ok(hr == S_OK, "Failed to get media type, hr %#x.\n", hr);
     ok(mediatype2 == mediatype3, "Unexpected instance.\n");
     IMFMediaType_Release(mediatype3);
 
     hr = IMFMediaTypeHandler_IsMediaTypeSupported(handler, mediatype2, NULL);
-    ok(hr == MF_E_INVALIDMEDIATYPE, "Unexpected hr %#x.\n", hr);
+    ok(hr == S_OK, "Unexpected hr %#x.\n", hr);
 
     IMFMediaType_Release(mediatype);
 
@@ -3026,39 +3043,8 @@ todo_wine
     ok(mediatype == mediatype2, "Unexpected instance.\n");
     IMFMediaType_Release(mediatype);
 
-    /* Type is validated against current type. */
-    hr = IMFMediaTypeHandler_IsMediaTypeSupported(handler, mediatype2, NULL);
-    ok(hr == S_OK, "Unexpected hr %#x.\n", hr);
-
     IMFMediaType_Release(mediatype2);
 
-    /* Set partial type. */
-    hr = MFCreateMediaType(&mediatype);
-    ok(hr == S_OK, "Failed to create media type, hr %#x.\n", hr);
-
-    hr = IMFMediaType_GetGUID(mediatype2, &MF_MT_SUBTYPE, &guid);
-    ok(hr == S_OK, "Failed to get attribute, hr %#x.\n", hr);
-
-    hr = IMFMediaType_SetGUID(mediatype, &MF_MT_MAJOR_TYPE, &MFMediaType_Audio);
-    ok(hr == S_OK, "Failed to set attribute, hr %#x.\n", hr);
-
-    hr = IMFMediaType_SetGUID(mediatype, &MF_MT_SUBTYPE, &guid);
-    ok(hr == S_OK, "Failed to set attribute, hr %#x.\n", hr);
-
-    hr = IMFMediaTypeHandler_SetCurrentMediaType(handler, mediatype);
-    ok(hr == S_OK, "Failed to set current type, hr %#x.\n", hr);
-
-    hr = IMFMediaTypeHandler_GetCurrentMediaType(handler, &mediatype2);
-    ok(hr == S_OK, "Unexpected hr %#x.\n", hr);
-    ok(mediatype == mediatype2, "Unexpected instance.\n");
-    IMFMediaType_Release(mediatype2);
-
-    hr = IMFMediaType_GetCount(mediatype, &count);
-    ok(hr == S_OK, "Unexpected hr %#x.\n", hr);
-    ok(count == 2, "Unexpected attribute count %u.\n", count);
-
-    IMFMediaType_Release(mediatype);
-
     /* Reset back to uninitialized state. */
     hr = IMFMediaTypeHandler_SetCurrentMediaType(handler, NULL);
     ok(hr == E_POINTER, "Unexpected hr %#x.\n", hr);
@@ -3121,10 +3107,8 @@ todo_wine
     IMFAudioStreamVolume_Release(stream_volume);
 
     hr = MFGetService((IUnknown *)sink, &MR_AUDIO_POLICY_SERVICE, &IID_IMFAudioPolicy, (void **)&unk);
-todo_wine
-    ok(hr == MF_E_NOT_INITIALIZED, "Failed to get interface, hr %#x.\n", hr);
-    if (SUCCEEDED(hr))
-        IUnknown_Release(unk);
+    ok(hr == S_OK, "Failed to get interface, hr %#x.\n", hr);
+    IUnknown_Release(unk);
 
     /* Shutdown */
     EXPECT_REF(present_clock, 2);