[Bug]: Arrow keys close IME dropdown in sp-number-field when entries with non-Arabic digits are highlighted

### Code of conduct

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

### Impacted component(s)

sp-number-field

### Library version

1.10.0

### Expected behavior

When entering input into an `sp-number-field`, an IME user should be able to use the arrow keys to freely move between various options (including conversion between double-byte and single-byte encodings) before committing.

### Actual behavior

Instead of allowing the user to move freely between IME options, the popup immediately closes when an item with non-Arabic digits is highlighted and the old value is restored.

This occurs in Express, Squirrel, and on the Storybook.

### Screenshots

_No response_

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

Chrome

### How can we reproduce this issue?

1. Go to the `sp-number-field` [Storybook](https://opensource.adobe.com/spectrum-web-components/storybook/index.html?path=/story/number-field/)
2. Ensure a Japanese keyboard is enabled
3. Click on the number field shown under "Enter a number"
4. Begin typing a number (e.g. 800) - it will initially render using double-byte characters (e.g. ８００)
5. Press down arrow to open the IME window; this allows users to choose between different ways of writing the number in Japanese.
6. Using the arrow keys, highlight an item with non-Arabic numerals (e.g. 八〇〇)
7. Note that the IME window immediately closes and the new value is lost

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

_No response_

### Severity

SEV 3

### Logs taken while reproducing problem

_No response_

### Would you like to track this issue in Jira?

- [x] Yes, please tell me the ticket number!

Start with the sp-number-field Storybook entry and reproduce the Japanese IME flow described in the issue. Inspect the component's keyboard and input handling; done means arrow keys can highlight non-Arabic numeral options without closing the IME popup, losing the new value, or restoring the old value.

Written by the indexing model from the issue text.