Cursor position moves right when un-converted Japanese is deleted

Scenario:

1. Run the QtVirtualKeyboard example (Qt Quick Virtual Keyboard - Basic Example)
2. Click the One line field, then the virtual keyboard popped up
3. Enter some characters and move cursor position to the left (beginning)
   1. For example: enter "12345" and move cursor potion to the left of "1"
4. Select Japanese from the language list
5. Click the key 'A' (Now 'あ' is shown in text input area)
6. Click delete key
7. 'あ' is deleted and cursor position moves right
8. Repeat step 5 -7
   1. Every time delete key is clicked cursor position moves right (It should stay at the same position)

Please take a look at the video for more detail.

basic 2021-05-26 15-49-33.mp4