Crash when typing Japanese in Text… | Apple Developer Forums

Crash when typing Japanese in TextEditor with TextSelection binding.

Environment

Mac mini M4 Pro
macOS: Version 15.1.1 (24B2091)
Xcode: Version 16.1 (16B40)
IME: Kotoeri, Google IME

Code description

struct ContentView: View {
    @State var text = “”
    @State var selection: TextSelection?

    var body: some View {
        VStack {
            TextEditor(text: $text, selection: $selection)
        }
        .padding()
    }
}

Issue Description

When built for macOS (not Catalyst, Designed for iPad) and typing “あ” in Japanese input, it crashes.

I tried using Kotoeri's Kana input, Kotoeri's Roman input, and Google IME, but the same error occurs and crashes in both cases.

There is no issue when using English input.

Errors

(input method 56222 com.apple.inputmethod.Kotoeri.KanaTyping) (1): Fatal error: String index is out of bounds

(input method 56338 com.apple.inputmethod.Kotoeri.RomajiTyping (1): Fatal error: String index is out of bounds

Swift/StringUTF16View.swift:368: Fatal error: String index is out of bounds