### Godot version

9f12e7b52d944

### System information

arch linux

### Issue description

Attempting to edit from the editor a typed array exported from a tool script fails, any value is immediately reset, setters are never called.

### Steps to reproduce

Create a script such as follows and try to add and then change items of the array in the inspector.


```gdscript
@tool
extends Node

@export var x: Array[String]
```

### Minimal reproduction project

n/a
if (!big_text_dialog) {
		big_text = memnew(TextEdit);
		if (expression) {
			big_text->set_syntax_highlighter(text->get_syntax_highlighter());
			big_text->add_theme_font_override("font", get_theme_font(SNAME("expression"), SNAME("EditorFonts")));
			big_text->add_theme_font_size_override("font_size", get_theme_font_size(SNAME("expression_size"), SNAME("EditorFonts")));
		}
		big_text->connect("text_changed", callable_mp(this, &EditorPropertyMultilineText::_big_text_changed));
		big_text->set_line_wrapping_mode(TextEdit::LineWrappingMode::LINE_WRAPPING_BOUNDARY);
		big_text_dialog = memnew(AcceptDialog);
		big_text_dialog->add_child(big_text);
		big_text_dialog->set_title(TTR("Edit Text:"));
		add_child(big_text_dialog);
	}
	big_text_dialog->popup_centered_clamped(Size2(1000, 900) * EDSCALE, 0.8);
	big_text->set_text(text->get_text());
	big_text->grab_focus();
}
void EditorPropertyMultilineText::update_property() {
	String t = get_edited_property_value();
	if (text->get_text() != t) {
		text->set_text(t);
		if (big_text && big_text->is_visible_in_tree()) {
			big_text->set_text(t);
		}
	}
}
void EditorPropertyMultilineText::_notification(int p_what) {