Initialize VirtualView parent offsets on attachment

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/views/virtual/view/ReactVirtualView.kt

@@ -51,10 +51,10 @@ public class ReactVirtualView(context: Context) :
   @VisibleForTesting
   internal fun doAttachedToWindow() {
     scrollView = getScrollView()
+    updateParentOffset()
     // onAttachedToWindow is usually called before layout but there are cases where it's called
     // after. If called after, we need to report the updated layout to the VirtualViewContainer
     if (hadLayout) {
-      updateParentOffset()
       reportRectChangeToContainer()
     }
     debugLog("doAttachedToWindow")
@@ -120,6 +120,8 @@ public class ReactVirtualView(context: Context) :
     mode = null
     modeChangeEmitter = null
     hadLayout = false
+    offsetX = 0
+    offsetY = 0
     lastContainerRelativeRect.setEmpty()
     lastClippingRect.setEmpty()
     containerRelativeRect.setEmpty()

packages/react-native/ReactAndroid/src/test/java/com/facebook/react/views/virtual/view/ReactVirtualViewTest.kt

@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+package com.facebook.react.views.virtual.view
+
+import android.app.Activity
+import android.content.Context
+import android.graphics.Rect
+import android.widget.FrameLayout
+import com.facebook.react.internal.featureflags.ReactNativeFeatureFlagsForTests
+import com.facebook.react.views.scroll.VirtualViewContainer
+import com.facebook.react.views.scroll.VirtualViewContainerState
+import com.facebook.react.views.view.ReactViewGroup
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.robolectric.Robolectric
+import org.robolectric.RobolectricTestRunner
+
+@RunWith(RobolectricTestRunner::class)
+class ReactVirtualViewTest {
+
+  private lateinit var context: Context
+  private lateinit var parent: ReactViewGroup
+
+  @Before
+  fun setUp() {
+    ReactNativeFeatureFlagsForTests.setUp()
+    context = Robolectric.buildActivity(Activity::class.java).create().get()
+
+    val container = TestVirtualViewContainer(context)
+    val content = ReactViewGroup(context)
+    parent = ReactViewGroup(context)
+    container.addView(content)
+    content.addView(parent)
+    content.layout(0, 0, 720, 5000)
+    parent.layout(0, 128, 720, 5000)
+  }
+
+  @Test
+  fun `containerRelativeRect includes parent offset when mounted under positioned parent`() {
+    val virtualView = mountVirtualView()
+
+    virtualView.layout(0, 300, 360, 727)
+
+    assertThat(virtualView.containerRelativeRect).isEqualTo(Rect(0, 428, 360, 855))
+  }
+
+  @Test
+  fun `containerRelativeRect follows parent movement after layout`() {
+    val virtualView = mountVirtualView()
+    virtualView.layout(0, 300, 360, 727)
+
+    parent.layout(0, 200, 720, 5000)
+
+    assertThat(virtualView.containerRelativeRect).isEqualTo(Rect(0, 500, 360, 927))
+  }
+
+  private fun mountVirtualView(): ReactVirtualView {
+    val virtualView = ReactVirtualView(context)
+    parent.addView(virtualView)
+    virtualView.doAttachedToWindow()
+    return virtualView
+  }
+
+  private class TestVirtualViewContainer(context: Context) :
+      FrameLayout(context), VirtualViewContainer {
+    override val virtualViewContainerState: VirtualViewContainerState =
+        VirtualViewContainerState.create(this)
+  }
+}