[Bug] 0.76 - border-radius with non-integer values causes faded bottom padding

Description

I have just updated to RN 0.76 and seeing some weird behavior with non integer values when applying corner radius. It creates a bottom padding that has a faded color.

Steps to reproduce

Create a simple view and apply the following values:

  return (
    <View className="h-full bg-indigo-900 p-4">
      <View
        style={{
          marginVertical: 400,
          borderTopLeftRadius: 10,
          borderTopRightRadius: 10,
          backgroundColor: 'white',
          padding: 14,
        }}
      />
    </View>

The output should look like this:

But instead it looks like this:

React Native Version

0.76.0

Affected Platforms

Runtime - iOS

Output of npx react-native info

System:
  OS: macOS 15.0.1
  CPU: (11) arm64 Apple M3 Pro
  Memory: 223.63 MB / 36.00 GB
  Shell:
    version: "5.9"
    path: /bin/zsh
Binaries:
  Node:
    version: 20.13.1
    path: ~/.local/share/mise/installs/node/20/bin/node
  Yarn:
    version: 4.5.1
    path: ~/.local/share/mise/installs/node/20/bin/yarn
  npm:
    version: 10.5.2
    path: ~/.local/share/mise/installs/node/20/bin/npm
  Watchman:
    version: 2024.10.21.00
    path: /opt/homebrew/bin/watchman
Managers:
  CocoaPods:
    version: 1.15.2
    path: /Users/osp/.local/share/mise/installs/ruby/3/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 24.0
      - iOS 18.0
      - macOS 15.0
      - tvOS 18.0
      - visionOS 2.0
      - watchOS 11.0
  Android SDK:
    API Levels:
      - "33"
      - "34"
      - "35"
    Build Tools:
      - 30.0.3
      - 33.0.0
      - 33.0.1
      - 34.0.0
      - 35.0.0
      - 35.0.0
    System Images:
      - android-33 | Google Play ARM 64 v8a
    Android NDK: 26.1.10909125
IDEs:
  Android Studio: 2024.2 AI-242.23339.11.2421.12483815
  Xcode:
    version: 16.0/16A242d
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 21.0.3
    path: /usr/bin/javac
  Ruby:
    version: 3.3.1
    path: /Users/osp/.local/share/mise/installs/ruby/3/bin/ruby
npmPackages:
  "@react-native-community/cli":
    installed: 15.0.0
    wanted: ^15.0.0
  react:
    installed: 18.3.1
    wanted: 18.3.1
  react-native:
    installed: 0.76.0
    wanted: 0.76.0
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: false
  newArchEnabled: false
iOS:
  hermesEnabled: Not found
  newArchEnabled: Not found

Stacktrace or Logs

*

Reproducer

https://github.com/ospfranco/border-radius-bug

Screenshots and Videos

No response

まず、iOS 上で React Native 0.76.0 を使ってリンクされた border-radius-bug の再現コードを実行し、その出力を期待されるスクリーンショットおよび実際のスクリーンショットと比較します。次に、整数以外の border-radius 値に対する iOS のレンダリングパスを追跡し、その後、薄く表示される下部の padding が表示されなくなり、提供された例が引き続き正しくレンダリングされることを確認します。