diff --git a/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/uimanager/LengthPercentage.kt b/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/uimanager/LengthPercentage.kt
index 1da94fa2672e..ed3c787e27ac 100644
--- a/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/uimanager/LengthPercentage.kt
+++ b/packages/react-native/ReactAndroid/src/main/java/com/facebook/react/uimanager/LengthPercentage.kt
@@ -51,6 +51,7 @@ public data class LengthPercentage(
             null
           }
         }
+        ReadableType.Null -> null
         else -> {
           FLog.w(ReactConstants.TAG, "Unsupported type for radius property: ${dynamic.type}")
           null
diff --git a/packages/react-native/ReactAndroid/src/test/java/com/facebook/react/uimanager/LengthPercentageTest.kt b/packages/react-native/ReactAndroid/src/test/java/com/facebook/react/uimanager/LengthPercentageTest.kt
new file mode 100644
index 000000000000..ce0df86e46db
--- /dev/null
+++ b/packages/react-native/ReactAndroid/src/test/java/com/facebook/react/uimanager/LengthPercentageTest.kt
@@ -0,0 +1,47 @@
+/*
+ * 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.uimanager
+
+import com.facebook.common.logging.FLog
+import com.facebook.react.bridge.DynamicFromObject
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.Test
+import org.mockito.Mockito.mockStatic
+
+class LengthPercentageTest {
+
+  @Test
+  fun parsesPointAndPercentageValues() {
+    assertThat(LengthPercentage.setFromDynamic(DynamicFromObject(12.0)))
+        .isEqualTo(LengthPercentage(12f, LengthPercentageType.POINT))
+    assertThat(LengthPercentage.setFromDynamic(DynamicFromObject("25%")))
+        .isEqualTo(LengthPercentage(25f, LengthPercentageType.PERCENT))
+  }
+
+  @Test
+  fun rejectsNegativeValuesByDefault() {
+    assertThat(LengthPercentage.setFromDynamic(DynamicFromObject(-1.0))).isNull()
+    assertThat(LengthPercentage.setFromDynamic(DynamicFromObject("-1%"))).isNull()
+  }
+
+  @Test
+  fun acceptsNegativeValuesWhenAllowed() {
+    assertThat(LengthPercentage.setFromDynamic(DynamicFromObject(-1.0), allowNegative = true))
+        .isEqualTo(LengthPercentage(-1f, LengthPercentageType.POINT))
+    assertThat(LengthPercentage.setFromDynamic(DynamicFromObject("-1%"), allowNegative = true))
+        .isEqualTo(LengthPercentage(-1f, LengthPercentageType.PERCENT))
+  }
+
+  @Test
+  fun clearsNullWithoutWarning() {
+    mockStatic(FLog::class.java).use { flog ->
+      assertThat(LengthPercentage.setFromDynamic(DynamicFromObject(null))).isNull()
+      flog.verifyNoInteractions()
+    }
+  }
+}
diff --git a/packages/react-native/ReactAndroid/src/test/java/com/facebook/react/views/scroll/ReactScrollViewPropertyTest.kt b/packages/react-native/ReactAndroid/src/test/java/com/facebook/react/views/scroll/ReactScrollViewPropertyTest.kt
new file mode 100644
index 000000000000..78fd8948678b
--- /dev/null
+++ b/packages/react-native/ReactAndroid/src/test/java/com/facebook/react/views/scroll/ReactScrollViewPropertyTest.kt
@@ -0,0 +1,133 @@
+/*
+ * 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.
+ */
+
+// The deprecated APIs exercised here remain public and required by this Robolectric setup.
+@file:Suppress("DEPRECATION")
+
+package com.facebook.react.views.scroll
+
+import android.annotation.SuppressLint
+import android.util.DisplayMetrics
+import android.view.View
+import com.facebook.react.bridge.BridgeReactContext
+import com.facebook.react.bridge.CatalystInstance
+import com.facebook.react.bridge.JavaOnlyMap
+import com.facebook.react.bridge.ReactTestHelper.createMockCatalystInstance
+import com.facebook.react.internal.featureflags.ReactNativeFeatureFlagsForTests
+import com.facebook.react.uimanager.BackgroundStyleApplicator
+import com.facebook.react.uimanager.DisplayMetricsHolder
+import com.facebook.react.uimanager.LengthPercentage
+import com.facebook.react.uimanager.LengthPercentageType
+import com.facebook.react.uimanager.ReactStylesDiffMap
+import com.facebook.react.uimanager.ThemedReactContext
+import com.facebook.react.uimanager.style.BorderRadiusProp
+import org.assertj.core.api.Assertions.assertThat
+import org.junit.After
+import org.junit.Before
+import org.junit.Test
+import org.junit.runner.RunWith
+import org.robolectric.RobolectricTestRunner
+import org.robolectric.RuntimeEnvironment
+
+/** Verifies border radius properties applied by the vertical and horizontal ScrollView managers. */
+@SuppressLint("DeprecatedClass", "DeprecatedMethod")
+@RunWith(RobolectricTestRunner::class)
+class ReactScrollViewPropertyTest {
+
+  private lateinit var context: BridgeReactContext
+  private lateinit var catalystInstanceMock: CatalystInstance
+  private lateinit var themedContext: ThemedReactContext
+
+  @Before
+  fun setup() {
+    ReactNativeFeatureFlagsForTests.setUp()
+    context = BridgeReactContext(RuntimeEnvironment.getApplication())
+    catalystInstanceMock = createMockCatalystInstance()
+    context.initializeWithInstance(catalystInstanceMock)
+    themedContext = ThemedReactContext(context, context, null, -1)
+    DisplayMetricsHolder.setScreenDisplayMetrics(DisplayMetrics())
+  }
+
+  @After
+  fun teardown() {
+    DisplayMetricsHolder.setScreenDisplayMetrics(null)
+  }
+
+  @Test
+  fun testVerticalBorderRadius() {
+    val manager = ReactScrollViewManager()
+    val view = manager.createViewInstance(themedContext)
+
+    assertBorderRadiusUpdates(view) { manager.updateProperties(view, it) }
+    assertDeprecatedFloatBorderRadius(view) { index, radius ->
+      manager.setBorderRadius(view, index, radius)
+    }
+  }
+
+  @Test
+  fun testHorizontalBorderRadius() {
+    val manager = ReactHorizontalScrollViewManager()
+    val view = manager.createViewInstance(themedContext)
+
+    assertBorderRadiusUpdates(view) { manager.updateProperties(view, it) }
+    assertDeprecatedFloatBorderRadius(view) { index, radius ->
+      manager.setBorderRadius(view, index, radius)
+    }
+  }
+
+  private fun assertBorderRadiusUpdates(
+      view: View,
+      updateProperties: (ReactStylesDiffMap) -> Unit,
+  ) {
+    val percentageRadii =
+        listOf(
+            Triple("borderRadius", BorderRadiusProp.BORDER_RADIUS, 10f),
+            Triple("borderTopLeftRadius", BorderRadiusProp.BORDER_TOP_LEFT_RADIUS, 20f),
+            Triple("borderTopRightRadius", BorderRadiusProp.BORDER_TOP_RIGHT_RADIUS, 30f),
+            Triple("borderBottomRightRadius", BorderRadiusProp.BORDER_BOTTOM_RIGHT_RADIUS, 40f),
+            Triple("borderBottomLeftRadius", BorderRadiusProp.BORDER_BOTTOM_LEFT_RADIUS, 50f),
+        )
+
+    percentageRadii.forEach { (name, property, value) ->
+      updateProperties(buildStyles(name, "$value%"))
+      assertThat(BackgroundStyleApplicator.getBorderRadius(view, property))
+          .isEqualTo(LengthPercentage(value, LengthPercentageType.PERCENT))
+    }
+
+    updateProperties(buildStyles("borderRadius", 12.0))
+    assertThat(BackgroundStyleApplicator.getBorderRadius(view, BorderRadiusProp.BORDER_RADIUS))
+        .isEqualTo(LengthPercentage(12f, LengthPercentageType.POINT))
+
+    updateProperties(buildStyles("borderRadius", -1.0))
+    assertThat(BackgroundStyleApplicator.getBorderRadius(view, BorderRadiusProp.BORDER_RADIUS))
+        .isNull()
+
+    updateProperties(buildStyles("borderRadius", 13.0))
+    assertThat(BackgroundStyleApplicator.getBorderRadius(view, BorderRadiusProp.BORDER_RADIUS))
+        .isEqualTo(LengthPercentage(13f, LengthPercentageType.POINT))
+
+    updateProperties(buildStyles("borderRadius", null))
+    assertThat(BackgroundStyleApplicator.getBorderRadius(view, BorderRadiusProp.BORDER_RADIUS))
+        .isNull()
+  }
+
+  private fun assertDeprecatedFloatBorderRadius(
+      view: View,
+      setBorderRadius: (Int, Float) -> Unit,
+  ) {
+    setBorderRadius(0, 8f)
+    assertThat(BackgroundStyleApplicator.getBorderRadius(view, BorderRadiusProp.BORDER_RADIUS))
+        .isEqualTo(LengthPercentage(8f, LengthPercentageType.POINT))
+
+    setBorderRadius(0, Float.NaN)
+    assertThat(BackgroundStyleApplicator.getBorderRadius(view, BorderRadiusProp.BORDER_RADIUS))
+        .isNull()
+  }
+
+  private fun buildStyles(vararg keysAndValues: Any?): ReactStylesDiffMap =
+      ReactStylesDiffMap(JavaOnlyMap.of(*keysAndValues))
+}