### Godot version

v4.2.dev4.official [549fcce5f]

### System information

Windows 10

### Issue description

`scene/main/node.cpp:1757 - Parameter "p_node" is null.` when attempting to type after using find function. Does not happen in 4.2dev3.

https://github.com/godotengine/godot/assets/3820082/4a2818f7-cc3b-4b46-a0b1-5bc6a85b4abc


### Steps to reproduce

1) Open any script in the script editor
2) Ctrl+F to select some text that exists in the script
3) Hit escape to re-focus the script editor without placing the caret
4) Attempt to type



### Minimal reproduction project

[find-mrp.zip](https://github.com/godotengine/godot/files/12555561/find-mrp.zip)

selection.begin = 0;
	selection.end = 0;
	selection.start_column = 0;
	selection.enabled = false;
	selection.creating = false;
	selection.double_click = false;
	queue_redraw();
}
bool LineEdit::has_selection() const {
	return selection.enabled;
}
String LineEdit::get_selected_text() {
	if (selection.enabled) {
		return text.substr(selection.begin, selection.end - selection.begin);
	} else {
		return String();
	}
}
int LineEdit::get_selection_from_column() const {
	ERR_FAIL_COND_V(!selection.enabled, -1);
	return selection.begin;
}
int LineEdit::get_selection_to_column() const {
	ERR_FAIL_COND_V(!selection.enabled, -1);
	return selection.end;
}
void LineEdit::selection_delete() {