diff --git a/core/java/com/android/internal/content/om/OverlayConfig.java b/core/java/com/android/internal/content/om/OverlayConfig.java
index b786526ce6760..fc0943bb3f632 100644
--- a/core/java/com/android/internal/content/om/OverlayConfig.java
+++ b/core/java/com/android/internal/content/om/OverlayConfig.java
@@ -140,7 +140,6 @@ public class OverlayConfig {
 
         ArrayMap<Integer, List<String>> activeApexesPerPartition = getActiveApexes(partitions);
 
-        boolean foundConfigFile = false;
         final Map<String, ParsedOverlayInfo> packageManagerOverlayInfos =
                 packageProvider == null ? null : getOverlayPackageInfos(packageProvider);
 
@@ -154,7 +153,6 @@ public class OverlayConfig {
                             activeApexesPerPartition.getOrDefault(partition.type,
                                     Collections.emptyList()));
             if (partitionOverlays != null) {
-                foundConfigFile = true;
                 overlays.addAll(partitionOverlays);
                 continue;
             }
@@ -191,12 +189,6 @@ public class OverlayConfig {
             overlays.addAll(partitionConfigs);
         }
 
-        if (!foundConfigFile) {
-            // If no overlay configuration files exist, disregard partition precedence and allow
-            // android:priority to reorder overlays across partition boundaries.
-            overlays.sort(sStaticOverlayComparator);
-        }
-
         for (int i = 0, n = overlays.size(); i < n; i++) {
             // Add the configurations to a map so definitions of an overlay in an earlier
             // partition can be replaced by an overlay with the same package name in a later
diff --git a/core/tests/coretests/src/com/android/internal/content/res/OverlayConfigTest.java b/core/tests/coretests/src/com/android/internal/content/res/OverlayConfigTest.java
index caec3651210ac..0f30cfead4f74 100644
--- a/core/tests/coretests/src/com/android/internal/content/res/OverlayConfigTest.java
+++ b/core/tests/coretests/src/com/android/internal/content/res/OverlayConfigTest.java
@@ -285,6 +285,39 @@ public class OverlayConfigTest {
         assertConfig(overlayConfig, "five", true, true, 4);
     }
 
+    @Test
+    public void testPartialConfigPartitionPrecedence() throws IOException {
+        createFile("/odm/overlay/config/config.xml",
+                "<config>"
+                        + "  <overlay package=\"two\" enabled=\"true\" />"
+                        + "</config>");
+
+        mScannerRule.addOverlay(createFile("/vendor/overlay/one.apk"), "one", "android", 0, true,
+                1);
+        mScannerRule.addOverlay(createFile("/odm/overlay/two.apk"), "two");
+        mScannerRule.addOverlay(createFile("/product/overlay/three.apk"), "three", "android", 0,
+                true, 0);
+
+        final OverlayConfig overlayConfig = createConfigImpl();
+        assertConfig(overlayConfig, "one", false, true, 0);
+        assertConfig(overlayConfig, "two", true, true, 1);
+        assertConfig(overlayConfig, "three", false, true, 2);
+    }
+
+    @Test
+    public void testNoConfigPartitionPrecedence() throws IOException {
+        mScannerRule.addOverlay(createFile("/vendor/overlay/one.apk"), "one", "android", 0, true,
+                1);
+        mScannerRule.addOverlay(createFile("/odm/overlay/two.apk"), "two", "android", 0, true, 2);
+        mScannerRule.addOverlay(createFile("/product/overlay/three.apk"), "three", "android", 0,
+                true, 0);
+
+        final OverlayConfig overlayConfig = createConfigImpl();
+        assertConfig(overlayConfig, "one", false, true, 0);
+        assertConfig(overlayConfig, "two", false, true, 1);
+        assertConfig(overlayConfig, "three", false, true, 2);
+    }
+
     @Test
     public void testImmutable() throws IOException {
         createFile("/product/overlay/config/config.xml",
@@ -506,37 +539,6 @@ public class OverlayConfigTest {
         assertConfig(overlayConfig, "two", false, true, 1);
     }
 
-    @Test
-    public void testNoConfigsAllowPartitionReordering() throws IOException {
-        mScannerRule.addOverlay(createFile("/vendor/overlay/one.apk"), "one", "android", 0, true,
-                1);
-        mScannerRule.addOverlay(createFile("/product/overlay/two.apk"), "two", "android", 0, true,
-                0);
-
-        final OverlayConfig overlayConfig = createConfigImpl();
-        assertConfig(overlayConfig, "one", false, true, 1);
-        assertConfig(overlayConfig, "two", false, true, 0);
-    }
-
-    @Test
-    public void testConfigDisablesPartitionReordering() throws IOException {
-        createFile("/odm/overlay/config/config.xml",
-                "<config>"
-                        + "  <overlay package=\"two\" enabled=\"true\" />"
-                        + "</config>");
-
-        mScannerRule.addOverlay(createFile("/vendor/overlay/one.apk"), "one", "android", 0, true,
-                1);
-        mScannerRule.addOverlay(createFile("/odm/overlay/two.apk"), "two");
-        mScannerRule.addOverlay(createFile("/product/overlay/three.apk"), "three", "android", 0,
-                true, 0);
-
-        final OverlayConfig overlayConfig = createConfigImpl();
-        assertConfig(overlayConfig, "one", false, true, 0);
-        assertConfig(overlayConfig, "two", true, true, 1);
-        assertConfig(overlayConfig, "three", false, true, 2);
-    }
-
     @Test
     public void testStaticOverlayOutsideOverlayDir() throws IOException {
         mScannerRule.addOverlay(createFile("/product/app/one.apk"), "one", "android", 0, true, 0);
@@ -550,7 +552,7 @@ public class OverlayConfigTest {
     @Test
     public void testSortStaticOverlaysDifferentTargets() throws IOException {
         mScannerRule.addOverlay(createFile("/vendor/overlay/one.apk"), "one", "other", 0, true, 0);
-        mScannerRule.addOverlay(createFile("/product/overlay/two.apk"), "two", "android", 0, true,
+        mScannerRule.addOverlay(createFile("/vendor/overlay/two.apk"), "two", "android", 0, true,
                 0);
 
         final OverlayConfig overlayConfig = createConfigImpl();
@@ -558,16 +560,34 @@ public class OverlayConfigTest {
         assertConfig(overlayConfig, "two", false, true, 0);
     }
 
+    @Test
+    public void testSortStaticOverlaysDifferentPartitions() throws IOException {
+        mScannerRule.addOverlay(createFile("/vendor/overlay/one.apk"), "one", "android", 0, true,
+                2);
+        mScannerRule.addOverlay(createFile("/vendor/overlay/two.apk"), "two", "android", 0, true,
+                3);
+        mScannerRule.addOverlay(createFile("/product/overlay/three.apk"), "three", "android", 0,
+                true, 0);
+        mScannerRule.addOverlay(createFile("/product/overlay/four.apk"), "four", "android", 0,
+                true, 1);
+
+        final OverlayConfig overlayConfig = createConfigImpl();
+        assertConfig(overlayConfig, "one", false, true, 0);
+        assertConfig(overlayConfig, "two", false, true, 1);
+        assertConfig(overlayConfig, "three", false, true, 2);
+        assertConfig(overlayConfig, "four", false, true, 3);
+    }
+
     @Test
     public void testSortStaticOverlaysSamePriority() throws IOException {
         mScannerRule.addOverlay(createFile("/vendor/overlay/one.apk"), "one", "android", 0, true,
                 0);
-        mScannerRule.addOverlay(createFile("/product/overlay/two.apk"), "two", "android", 0, true,
+        mScannerRule.addOverlay(createFile("/vendor/overlay/two.apk"), "two", "android", 0, true,
                 0);
 
         final OverlayConfig overlayConfig = createConfigImpl();
-        assertConfig(overlayConfig, "one", false, true, 1);
-        assertConfig(overlayConfig, "two", false, true, 0);
+        assertConfig(overlayConfig, "one", false, true, 0);
+        assertConfig(overlayConfig, "two", false, true, 1);
     }
 
     @Test