• I have reviewed the documentation
• I have searched existing issues
• I am using the latest React Native version

Environment

Environment:
OS: macOS High Sierra 10.13.4
Node: 8.9.0
Yarn: 1.5.1
npm: 5.5.1
Watchman: 4.9.0
Xcode: Xcode 9.3 Build version 9E145
Android Studio: 3.0 AI-171.4443003

Packages: (wanted => installed)
react: ^16.3.2 => 16.3.2
react-native: ^0.55.3 => 0.55.3

Steps to Reproduce

export class Test extends React.PureComponent {

    state = {
        text: "",
    };

    render() {
        return (
            <View>
                <Text>test:</Text>
                <TextInput
                    value={this.state.text}
                    onChangeText={text => this.setState({ text })}
                />
            </View>
        );
    }
}

try input some Chinese using soft keyboard

Expected Behavior

Textinput works like Textinput in 0.51

Actual Behavior

Can't select Chinese character from pinyin.
It only works if value={this.state.text} is removed