### 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)
_THREAD_SAFE_METHOD_
	const ShapedTextDataAdvanced *sd = shaped_owner.get_or_null(p_shaped);
	ERR_FAIL_COND_V(!sd, String());
	return sd->custom_punct;
}
void TextServerAdvanced::_shaped_text_set_bidi_override(const RID &p_shaped, const Array &p_override) {
	ShapedTextDataAdvanced *sd = shaped_owner.get_or_null(p_shaped);
	ERR_FAIL_COND(!sd);
	MutexLock lock(sd->mutex);
	if (sd->parent != RID()) {
		full_copy(sd);
	}
	sd->bidi_override.clear();
	for (int i = 0; i < p_override.size(); i++) {
		if (p_override[i].get_type() == Variant::VECTOR3I) {
			const Vector3i &r = p_override[i];
			sd->bidi_override.push_back(r);
		} else if (p_override[i].get_type() == Variant::VECTOR2I) {
			const Vector2i &r = p_override[i];
			sd->bidi_override.push_back(Vector3i(r.x, r.y, DIRECTION_INHERITED));
		}
	}
	invalidate(sd, false);
}
void TextServerAdvanced::_shaped_text_set_orientation(const RID &p_shaped, TextServer::Orientation p_orientation) {