How to reproduce:
1. Create a new project
2. Install com.unity.ai.assistant
3. Open the Assistant window (Window → AI → Assistant)
4. Switch to “Japanese - Kana” keyboard language
5. Type “aaaaa” or until composition pop-up appears
6. Press the enter/return key
7. Observe the Assistant window
Actual result: The prompt is sent to the assistant
Expected result: The IME composition is confirmed, but the prompt is not sent
Reproducible with: 1.5.0-pre.2 (6000.3.6f1, 6000.4.0b7, 6000.5.0a6)
Could not test with: 1.0.0-pre.12 (Any versions before beta do not accept prompts), 1.5.0-pre.2 (6000.0.66f1) (Not supported)
Reproducible on: MacOS Sequoia 15.7.3 (M1 Max)
Not reproducible on: Windows 11