[Bug]: [Win]:[ja-JP]: Candidate window not shown under Search Box field for <sp-search> while typing

### Code of conduct

- [x] I agree to follow this project's code of conduct.

### Impacted component(s)

Search

### Expected behavior

Candidate window should appear wherever typing JP IME on Win (Please refer expected behavior from screenshot captured from Mac)

### Actual behavior

Candidate window is not shown when typing JP IME in search box on Win


### Screenshots

_No response_

### What browsers are you seeing the problem in?

_No response_

### How can we reproduce this issue?

1. Open Squirrel web with Chrome browser on Win

2. At Home page, scroll down to project search box

3. Select Hiragana option from the JP IME and type "asahi" on the qwerty keyboard

4. Observe

### Sample code or abstract reproduction which illustrates the problem

_No response_

### Severity

SEV 3

### Logs taken while reproducing problem

_No response_

Start by reproducing the issue in the field on the Squirrel web home page with Chrome on Windows, using Japanese Hiragana IME and typing "asahi". Then inspect the entry point and its search-input behavior. Done means the Japanese IME candidate window appears while typing on Windows, matching the expected behavior shown in the issue.

Written by the indexing model from the issue text.