### 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 && selection.enabled && !pass) {
		DisplayServer::get_singleton()->clipboard_set(get_selected_text());
		selection_delete();
	}
}
void LineEdit::paste_text() {
	if (!editable) {
		return;
	}
	
	String paste_buffer = DisplayServer::get_singleton()->clipboard_get().strip_escapes();
	if (!paste_buffer.is_empty()) {
		int prev_len = text.length();
		if (selection.enabled) {
			selection_delete();
		}
		insert_text_at_caret(paste_buffer);
		if (!text_changed_dirty) {
			if (is_inside_tree() && text.length() != prev_len) {
				MessageQueue::get_singleton()->push_call(this, "_text_changed");
			}
			text_changed_dirty = true;
		}
	}
}
bool LineEdit::has_undo() const {