### 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)
#endif
			}
			memset(&fd->stream, 0, sizeof(FT_StreamRec));
			fd->stream.base = (unsigned char *)p_font_data->data_ptr;
			fd->stream.size = p_font_data->data_size;
			fd->stream.pos = 0;
			FT_Open_Args fargs;
			memset(&fargs, 0, sizeof(FT_Open_Args));
			fargs.memory_base = (unsigned char *)p_font_data->data_ptr;
			fargs.memory_size = p_font_data->data_size;
			fargs.flags = FT_OPEN_MEMORY;
			fargs.stream = &fd->stream;
			int max_index = 0;
			FT_Face tmp_face = nullptr;
			error = FT_Open_Face(ft_library, &fargs, -1, &tmp_face);
			if (tmp_face && error 
				max_index = tmp_face->num_faces - 1;
			}
			if (tmp_face) {
				FT_Done_Face(tmp_face);
			}
			error = FT_Open_Face(ft_library, &fargs, CLAMP(p_font_data->face_index, 0, max_index), &fd->face);
			if (error) {
				FT_Done_Face(fd->face);
				fd->face = nullptr;
				memdelete(fd);
				ERR_FAIL_V_MSG(false, "FreeType: Error loading font: '" + String(FT_Error_String(error)) + "'.");
			}
		}
		if (p_font_data->msdf) {