diff --git a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
index c5c13e9..2661c30 100644
--- a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
+++ b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
@@ -5446,6 +5446,12 @@
         }
     }
 
+    // Do not retrieve engine device for outputs through MSD
+    // TODO: support explicit routing requests by resetting MSD patch to engine device.
+    if (outputDesc->devices() == getMsdAudioOutDevices()) {
+        return outputDesc->devices();
+    }
+
     // Honor explicit routing requests only if no client using default routing is active on this
     // input: a specific app can not force routing for other apps by setting a preferred device.
     bool active; // unused
diff --git a/services/audiopolicy/tests/AudioPolicyManagerTestClient.h b/services/audiopolicy/tests/AudioPolicyManagerTestClient.h
index e1721ea..bdddf06 100644
--- a/services/audiopolicy/tests/AudioPolicyManagerTestClient.h
+++ b/services/audiopolicy/tests/AudioPolicyManagerTestClient.h
@@ -75,6 +75,10 @@
     status_t createAudioPatch(const struct audio_patch *patch,
                               audio_patch_handle_t *handle,
                               int /*delayMs*/) override {
+        auto iter = mActivePatches.find(*handle);
+        if (iter != mActivePatches.end()) {
+            mActivePatches.erase(*handle);
+        }
         *handle = mNextPatchHandle++;
         mActivePatches.insert(std::make_pair(*handle, *patch));
         return NO_ERROR;