[IOS][TextInput] TextInput multiline behavior changed between RN 0.79 and 0.81

[loopwic]

Description

A plain TextInput with multiline no longer auto-expands in React Native 0.81. The exact same code worked in RN 0.79.

Steps to reproduce

• Create a simple RN project.
• Paste the following code:

import { View, TextInput } from "react-native";

export default function App() {
  return (
    <View>
      <TextInput
        multiline
        style={{ backgroundColor: "#eee" }}
      />
    </View>
  );
}

• Run on iOS or Android.
• Type multiple lines.

React Native Version

0.81.1

Affected Platforms

Build - MacOS

Output of npx @react-native-community/cli info

System:
  OS: macOS 26.0
  CPU: (16) arm64 Apple M3 Max
  Memory: 372.55 MB / 48.00 GB
  Shell:
    version: 4.0.2
    path: /opt/homebrew/bin/fish
Binaries:
  Node:
    version: 20.19.4
    path: ~/.local/share/nvm/v20.19.4/bin/node
  Yarn: Not Found
  npm:
    version: 10.8.2
    path: ~/.local/share/nvm/v20.19.4/bin/npm
  Watchman:
    version: 2025.09.01.00
    path: /opt/homebrew/bin/watchman
Managers:
  CocoaPods:
    version: 1.16.2
    path: /opt/homebrew/bin/pod
SDKs:
  iOS SDK:
    Platforms:
      - DriverKit 25.0
      - iOS 26.0
      - macOS 26.0
      - tvOS 26.0
      - visionOS 26.0
      - watchOS 26.0
  Android SDK:
    API Levels:
      - "36"
    Build Tools:
      - 35.0.0
      - 36.0.0
    System Images:
      - android-36 | Google APIs ARM 64 v8a
      - android-36 | Google APIs Intel x86_64 Atom
    Android NDK: Not Found
IDEs:
  Android Studio: 2025.1 AI-251.26094.121.2513.14007798
  Xcode:
    version: 26.0/17A5305k
    path: /usr/bin/xcodebuild
Languages:
  Java:
    version: 17.0.16
    path: /opt/homebrew/opt/openjdk@17/bin/javac
  Ruby:
    version: 2.6.10
    path: /usr/bin/ruby
npmPackages:
  "@react-native-community/cli": Not Found
  react:
    installed: 19.1.0
    wanted: 19.1.0
  react-native:
    installed: 0.81.1
    wanted: 0.81.1
  react-native-macos: Not Found
npmGlobalPackages:
  "*react-native*": Not Found
Android:
  hermesEnabled: Not found
  newArchEnabled: Not found
iOS:
  hermesEnabled: Not found
  newArchEnabled: Not found

Stacktrace or Logs

none

MANDATORY Reproducer

https://expo.dev/accounts/loopwic/snacks

Screenshots and Videos

No response

[react-native-bot]

Warning

Missing reproducer: We could not detect a reproducible example in your issue report. Reproducers are mandatory and we can accept only one of those as a valid reproducer:

• For majority of bugs: send us a Pull Request with the RNTesterPlayground.js edited to reproduce your bug.
• If your bug is UI related: a Snack
• If your bug is build/upgrade related: a project using our Reproducer Template

You can read more about about it on our website: How to report a bug.

[loopwic]

This issue was opened by mistake. Please disregard.