diff --git a/services/core/java/com/android/server/wm/LetterboxUiController.java b/services/core/java/com/android/server/wm/LetterboxUiController.java
index f355f088b608e..5db39fc8434c8 100644
--- a/services/core/java/com/android/server/wm/LetterboxUiController.java
+++ b/services/core/java/com/android/server/wm/LetterboxUiController.java
@@ -997,7 +997,8 @@ final class LetterboxUiController {
 
     @VisibleForTesting
     boolean shouldShowLetterboxUi(WindowState mainWindow) {
-        return isSurfaceVisible(mainWindow) && mainWindow.areAppWindowBoundsLetterboxed()
+        return (mActivityRecord.isInLetterboxAnimation() || isSurfaceVisible(mainWindow))
+                && mainWindow.areAppWindowBoundsLetterboxed()
                 // Check for FLAG_SHOW_WALLPAPER explicitly instead of using
                 // WindowContainer#showWallpaper because the later will return true when this
                 // activity is using blurred wallpaper for letterbox background.
@@ -1104,7 +1105,7 @@ final class LetterboxUiController {
     // for all corners for consistency and pick a minimal bottom one for consistency with a
     // taskbar rounded corners.
     int getRoundedCornersRadius(final WindowState mainWindow) {
-        if (!requiresRoundedCorners(mainWindow) || mActivityRecord.isInLetterboxAnimation()) {
+        if (!requiresRoundedCorners(mainWindow)) {
             return 0;
         }
 
diff --git a/services/tests/wmtests/src/com/android/server/wm/LetterboxUiControllerTest.java b/services/tests/wmtests/src/com/android/server/wm/LetterboxUiControllerTest.java
index 06b6ed83d28c3..da078a22c5fff 100644
--- a/services/tests/wmtests/src/com/android/server/wm/LetterboxUiControllerTest.java
+++ b/services/tests/wmtests/src/com/android/server/wm/LetterboxUiControllerTest.java
@@ -459,8 +459,17 @@ public class LetterboxUiControllerTest extends WindowTestsBase {
         mainWindow.mInvGlobalScale = invGlobalScale;
         mLetterboxConfiguration.setLetterboxActivityCornersRadius(configurationRadius);
 
+        doReturn(true).when(mActivity).isInLetterboxAnimation();
         assertEquals(expectedRadius, mController.getRoundedCornersRadius(mainWindow));
 
+        doReturn(false).when(mActivity).isInLetterboxAnimation();
+        assertEquals(expectedRadius, mController.getRoundedCornersRadius(mainWindow));
+
+        doReturn(false).when(mainWindow).isOnScreen();
+        assertEquals(0, mController.getRoundedCornersRadius(mainWindow));
+
+        doReturn(true).when(mActivity).isInLetterboxAnimation();
+        assertEquals(expectedRadius, mController.getRoundedCornersRadius(mainWindow));
     }
 
     @Test
@@ -495,6 +504,7 @@ public class LetterboxUiControllerTest extends WindowTestsBase {
             insets.addSource(taskbar);
         }
         doReturn(mLetterboxedPortraitTaskBounds).when(mActivity).getBounds();
+        doReturn(false).when(mActivity).isInLetterboxAnimation();
         doReturn(true).when(mActivity).isVisible();
         doReturn(true).when(mActivity).isLetterboxedForFixedOrientationAndAspectRatio();
         doReturn(insets).when(mainWindow).getInsetsState();