### 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)
}
		icu_data_loaded = true;
	}
#endif
	return true;
}
String TextServerAdvanced::_get_support_data_filename() const {
	return _MKSTR(ICU_DATA_NAME);
}
String TextServerAdvanced::_get_support_data_info() const {
	return String("ICU break iteration data (") + _MKSTR(ICU_DATA_NAME) + String(").");
}
bool TextServerAdvanced::_save_support_data(const String &p_filename) const {
	_THREAD_SAFE_METHOD_
#ifdef ICU_STATIC_DATA
	
	Ref<FileAccess> f = FileAccess::open(p_filename, FileAccess::WRITE);
	if (f.is_null()) {
		return false;
	}
	PackedByteArray icu_data;
	icu_data.resize(U_ICUDATA_SIZE);
	memcpy(icu_data.ptrw(), U_ICUDATA_ENTRY_POINT, U_ICUDATA_SIZE);
	f->store_buffer(icu_data);
	return true;
#else
	return false;
#endif
}
bool TextServerAdvanced::_is_locale_right_to_left(const String &p_locale) const {