TextField in UIToolkit is not cleared when entering Korean characters

Reproduction steps:
1. Open the attached “textfield_clear.zip” project
2. Open the “Assets/TextField/textfield-scene.unity“ Scene
3. Enter the Play Mode
4. Click the “ShowUI” button in the Game view
5. Enter some Korean characters in the Text Input Field manually
6. Click the “Clear” button in the Game view
7. Repeat 5-6 steps a few times
8. Observe the Text Input Field in the Game view

Expected result: Only newly entered Korean characters should appear in the text field
Actual result: The placeholder text "Untitled" remains and newly entered Korean characters appear along with it

Reproducible with: 2022.3.60f1, 6000.0.44f1, 6000.1.0b12, 6000.2.0a8

Reproducible on: Windows 11
Not reproducible on: No other environment tested