### 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 (caret_force_displayed == p_enabled) {
		return;
	}
	caret_force_displayed = p_enabled;
	_validate_caret_can_draw();
	queue_redraw();
}
float LineEdit::get_caret_blink_interval() const {
	return caret_blink_interval;
}
void LineEdit::set_caret_blink_interval(const float p_interval) {
	ERR_FAIL_COND(p_interval <= 0);
	caret_blink_interval = p_interval;
}
void LineEdit::_reset_caret_blink_timer() {
	if (caret_blink_enabled) {
		draw_caret = true;
		if (caret_can_draw) {
			caret_blink_timer = 0.0;
			queue_redraw();
		}
	}
}
void LineEdit::_toggle_draw_caret() {
	draw_caret = !draw_caret;
	if (is_visible_in_tree() && caret_can_draw) {
		queue_redraw();
	}
}
void LineEdit::_validate_caret_can_draw() {