### 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)
Char16String utf16 = p_string.utf16();
	Vector<UChar *> skeletons;
	skeletons.resize(p_dict.size());
	if (sc_conf == nullptr) {
		sc_conf = uspoof_open(&status);
		uspoof_setChecks(sc_conf, USPOOF_CONFUSABLE, &status);
	}
	for (int i = 0; i < p_dict.size(); i++) {
		Char16String word = p_dict[i].utf16();
		int32_t len = uspoof_getSkeleton(sc_conf, 0, word.get_data(), -1, NULL, 0, &status);
		skeletons.write[i] = (UChar *)memalloc(++len * sizeof(UChar));
		status = U_ZERO_ERROR;
		uspoof_getSkeleton(sc_conf, 0, word.get_data(), -1, skeletons.write[i], len, &status);
	}
	int32_t len = uspoof_getSkeleton(sc_conf, 0, utf16.get_data(), -1, NULL, 0, &status);
	UChar *skel = (UChar *)memalloc(++len * sizeof(UChar));
	status = U_ZERO_ERROR;
	uspoof_getSkeleton(sc_conf, 0, utf16.get_data(), -1, skel, len, &status);
	for (int i = 0; i < skeletons.size(); i++) {
		if (u_strcmp(skel, skeletons[i]
			match_index = i;
			
		}
	}
	memfree(skel);
	for (int i = 0; i < skeletons.size(); i++) {
		memfree(skeletons.write[i]);
	}
	ERR_FAIL_COND_V_MSG(U_FAILURE(status), -1, u_errorName(status));
	return match_index;