### 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)
const SystemFontCache &sysf_cache = system_fonts[key];
					int best_score = 0;
					int best_match = -1;
					for (int face_idx = 0; face_idx < sysf_cache.var.size(); face_idx++) {
						const SystemFontCacheRec &F = sysf_cache.var[face_idx];
						if (unlikely(!_font_has_char(F.rid, text[0]))) {
							continue;
						}
						BitField<FontStyle> style = _font_get_style(F.rid);
						int weight = _font_get_weight(F.rid);
						int stretch = _font_get_stretch(F.rid);
						int score = (20 - Math::abs(weight - font_weight) / 50);
						score += (20 - Math::abs(stretch - font_stretch) / 10);
						if (bool(style & TextServer::FONT_ITALIC) == bool(font_style & TextServer::FONT_ITALIC)) {
							score += 30;
						}
						if (score >= best_score) {
							best_score = score;
							best_match = face_idx;
						}
						if (best_score == 70) {
							
						}
					}
					if (best_match != -1) {
						f = sysf_cache.var[best_match].rid;
					}
				}
				if (!f.is_valid()) {
					if (system_fonts.has(key)) {