### 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)
}
				if (os2->ulUnicodeRange4 & 1L << 17) {
					p_font_data->supported_scripts.insert(HB_SCRIPT_LEPCHA);
				}
				if (os2->ulUnicodeRange4 & 1L << 18) {
					p_font_data->supported_scripts.insert(HB_SCRIPT_OL_CHIKI);
				}
				if (os2->ulUnicodeRange4 & 1L << 19) {
					p_font_data->supported_scripts.insert(HB_SCRIPT_SAURASHTRA);
				}
				if (os2->ulUnicodeRange4 & 1L << 20) {
					p_font_data->supported_scripts.insert(HB_SCRIPT_KAYAH_LI);
				}
				if (os2->ulUnicodeRange4 & 1L << 21) {
					p_font_data->supported_scripts.insert(HB_SCRIPT_REJANG);
				}
				if (os2->ulUnicodeRange4 & 1L << 22) {
					p_font_data->supported_scripts.insert(HB_SCRIPT_CHAM);
				}
				if (os2->ulUnicodeRange4 & 1L << 25) {
					p_font_data->supported_scripts.insert(HB_SCRIPT_ANATOLIAN_HIEROGLYPHS);
				}
			}
			
			p_font_data->supported_features.clear();
			count = hb_ot_layout_table_get_feature_tags(hb_face, HB_OT_TAG_GSUB, 0, nullptr, nullptr);
			if (count != 0) {
				hb_tag_t *feature_tags = (hb_tag_t *)memalloc(count * sizeof(hb_tag_t));
				hb_ot_layout_table_get_feature_tags(hb_face, HB_OT_TAG_GSUB, 0, &count, feature_tags);
				for (unsigned int i = 0; i < count; i++) {