### 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)
} 
		case DIRECTION_RTL: {
			sd->para_direction = DIRECTION_RTL;
			sd->base_para_direction = UBIDI_RTL;
		} 
		case DIRECTION_INHERITED:
		case DIRECTION_AUTO: {
			UBiDiDirection direction = ubidi_getBaseDirection(data, sd->utf16.length());
			if (direction != UBIDI_NEUTRAL) {
				sd->para_direction = (direction == UBIDI_RTL) ? DIRECTION_RTL : DIRECTION_LTR;
				sd->base_para_direction = direction;
			} else {
				sd->para_direction = DIRECTION_LTR;
				sd->base_para_direction = UBIDI_DEFAULT_LTR;
			}
		} 
	}
	if (sd->bidi_override.is_empty()) {
		sd->bidi_override.push_back(Vector3i(sd->start, sd->end, DIRECTION_INHERITED));
	}
	for (int ov = 0; ov < sd->bidi_override.size(); ov++) {
		
		int start = _convert_pos_inv(sd, sd->bidi_override[ov].x - sd->start);
		int end = _convert_pos_inv(sd, sd->bidi_override[ov].y - sd->start);
		if (start < 0 || end - start > sd->utf16.length()) {
			continue;
		}
		UErrorCode err = U_ZERO_ERROR;
		UBiDi *bidi_iter = ubidi_openSized(end - start, 0, &err);
		if (U_SUCCESS(err)) {