### 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)

if (!selecting_enabled) {
		return;
	}
	if (!text.length()) {
		return;
	}
	selection.begin = 0;
	selection.end = text.length();
	selection.enabled = true;
	queue_redraw();
}
void LineEdit::set_editable(bool p_editable) {
	if (editable == p_editable) {
		return;
	}
	editable = p_editable;
	_validate_caret_can_draw();
	update_minimum_size();
	queue_redraw();
}
bool LineEdit::is_editable() const {