### Godot version

v4.2.dev4.official [549fcce5f]

### System information

Ubuntu 20.04 LTS

### Issue description

See title.

### Steps to reproduce

1. Create a new project
2. Create a csv file that includes the following
```
key,ar
key,placeholder
```
3. Add the generated `.translation` file to Project -> Project Settings... -> Localization
4. In Project -> Project Settings... -> Internationalization -> Locale, set `Test` to `ar`
5. Add a `LineEdit` node and type `-=[]{}`
6. Run the project, and notice that the text is on the right side, but the symbols are incorrectly in LTR (`-=[]{}`).  Correct output is `{}[]=-`
7. Back in the editor, add a single Arabic letter (any will do), and notice that `LineEdit` immediately (and correctly) flips the symbols, and the newly-added Arabic letter, to RTL.

**Notes**
- Identical behavior is seen with `TextEdit`.
- The purpose of steps 2-4 are to simulate an Arabic environment when the project is run, despite `OS.get_locale() == "en"` (or your system's current language).

### Minimal reproduction project

[rtlsymbols.zip](https://github.com/godotengine/godot/files/12525509/rtlsymbols.zip)
ERR_FAIL_COND_V(p_size.x <= 0, false);
	if (p_font_data->cache.has(p_size)) {
		return true;
	}
	FontForSizeAdvanced *fd = memnew(FontForSizeAdvanced);
	fd->size = p_size;
	if (p_font_data->data_ptr && (p_font_data->data_size > 0)) {
		
#ifdef MODULE_FREETYPE_ENABLED
		int error = 0;
		{
			MutexLock ftlock(ft_mutex);
			if (!ft_library) {
				error = FT_Init_FreeType(&ft_library);
				if (error != 0) {
					memdelete(fd);
					ERR_FAIL_V_MSG(false, "FreeType: Error initializing library: '" + String(FT_Error_String(error)) + "'.");
				}
#ifdef MODULE_SVG_ENABLED
				FT_Property_Set(ft_library, "ot-svg", "svg-hooks", get_tvg_svg_in_ot_hooks());