The word selection always in bottom or some strange place when input chinese

[JalorOo]

When use the latest zefyr version(1.0.0-rc.5)

Steps to Reproduce

1. just change keyboard to input chinese
2. input something

you can see the word selection is not bellow the cursor. but in normal the word selection should under the cursor, like the picture as follow:

[✓] Flutter (Channel stable, 2.10.1, on macOS 11.6 20G165 darwin-x64, locale zh-Hans-CN)
• Flutter version 2.10.1 at /Library/flutter
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! Doctor found issues in 2 categories.