### 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 (selection.enabled) {
		delete_text(selection.begin, selection.end);
	}
	deselect();
}
void LineEdit::set_max_length(int p_max_length) {
	ERR_FAIL_COND(p_max_length < 0);
	max_length = p_max_length;
	set_text(text);
}
int LineEdit::get_max_length() const {
	return max_length;
}
void LineEdit::selection_fill_at_caret() {
	if (!selecting_enabled) {
		return;
	}
	selection.begin = caret_column;
	selection.end = selection.start_column;
	if (selection.end < selection.begin) {
		int aux = selection.end;
		selection.end = selection.begin;
		selection.begin = aux;
	}
	selection.enabled = (selection.begin != selection.end);
}
void LineEdit::select_all() {