diff --git a/cli/bpmetadata/tfconfig.go b/cli/bpmetadata/tfconfig.go
index 7363f5985a5..e589bdc8558 100644
--- a/cli/bpmetadata/tfconfig.go
+++ b/cli/bpmetadata/tfconfig.go
@@ -535,6 +535,9 @@ func mergeExistingOutputTypes(newInterfaces, existingInterfaces *BlueprintInterf
 	}
 
 	for i, output := range newInterfaces.Outputs {
+		if output.Type != nil {
+			continue
+		}
 		if existingOutput, ok := existingOutputs[output.Name]; ok && existingOutput.Type != nil {
 			newInterfaces.Outputs[i].Type = existingOutput.Type
 		}
diff --git a/cli/bpmetadata/tfconfig_test.go b/cli/bpmetadata/tfconfig_test.go
index 7e1ea600365..b65a44dbef7 100644
--- a/cli/bpmetadata/tfconfig_test.go
+++ b/cli/bpmetadata/tfconfig_test.go
@@ -351,21 +351,31 @@ func TestMergeExistingOutputTypes(t *testing.T) {
 		name                   string
 		newInterfacesFile      string
 		existingInterfacesFile string
+		expectedInterfacesFile string
 	}{
 		{
 			name:                   "No existing types",
 			newInterfacesFile:      "interfaces_without_output_types_metadata.yaml",
 			existingInterfacesFile: "interfaces_without_output_types_metadata.yaml",
+			expectedInterfacesFile: "interfaces_without_output_types_metadata.yaml",
 		},
 		{
 			name:                   "One complex existing type is preserved",
 			newInterfacesFile:      "interfaces_without_output_types_metadata.yaml",
 			existingInterfacesFile: "interfaces_with_partial_output_types_metadata.yaml",
+			expectedInterfacesFile: "interfaces_with_partial_output_types_metadata.yaml",
 		},
 		{
 			name:                   "All existing types (both simple and complex) are preserved",
 			newInterfacesFile:      "interfaces_without_output_types_metadata.yaml",
 			existingInterfacesFile: "interfaces_with_full_output_types_metadata.yaml",
+			expectedInterfacesFile: "interfaces_with_full_output_types_metadata.yaml",
+		},
+		{
+			name:                   "Previous types are not overwriting newly generated types",
+			newInterfacesFile:      "interfaces_with_new_output_types_metadata.yaml",
+			existingInterfacesFile: "interfaces_with_partial_output_types_metadata.yaml",
+			expectedInterfacesFile: "interfaces_with_new_output_types_metadata.yaml",
 		},
 	}
 
@@ -382,8 +392,12 @@ func TestMergeExistingOutputTypes(t *testing.T) {
 			// Perform the merge
 			mergeExistingOutputTypes(newInterfaces.Spec.Interfaces, existingInterfaces.Spec.Interfaces)
 
+			// Load expected interfaces from file
+			expectedInterfaces, err := UnmarshalMetadata(metadataTestdataPath, tt.expectedInterfacesFile)
+			require.NoError(t, err)
+
 			// Assert that the merged interfaces match the expected outcome
-			assert.Equal(t, existingInterfaces.Spec.Interfaces, newInterfaces.Spec.Interfaces)
+			assert.Equal(t, expectedInterfaces.Spec.Interfaces, newInterfaces.Spec.Interfaces)
 		})
 	}
 }
diff --git a/cli/testdata/bpmetadata/metadata/interfaces_with_new_output_types_metadata.yaml b/cli/testdata/bpmetadata/metadata/interfaces_with_new_output_types_metadata.yaml
new file mode 100644
index 00000000000..424365c833c
--- /dev/null
+++ b/cli/testdata/bpmetadata/metadata/interfaces_with_new_output_types_metadata.yaml
@@ -0,0 +1,16 @@
+apiVersion: blueprints.cloud.google.com/v1alpha1
+kind: BlueprintMetadata
+metadata:
+  name: terraform-google-network
+spec:
+  interfaces:
+    outputs:
+    - name: cluster_id
+      description: Cluster ID
+      type: string 
+    - name: endpoint
+      description: Cluster endpoint
+      type: 
+        - tuple
+          - string
+            number
\ No newline at end of file