### 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 (!editable) {
		return;
	}
	if (undo_stack_pos == nullptr) {
		return;
	}
	if (undo_stack_pos == undo_stack.back()) {
		return;
	}
	deselect();
	undo_stack_pos = undo_stack_pos->next();
	TextOperation op = undo_stack_pos->get();
	text = op.text;
	scroll_offset = op.scroll_offset;
	set_caret_column(op.caret_column);
	_shape();
	_emit_text_change();
}
void LineEdit::shift_selection_check_pre(bool p_shift) {