### 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)

CaretInfo caret;
	
	if (ime_text.length() != 0 && ime_selection.x != 0) {
		caret = TS->shaped_text_get_carets(text_rid, caret_column + ime_selection.x);
	} else {
		caret = TS->shaped_text_get_carets(text_rid, caret_column);
	}
	if ((caret.l_caret != Rect2() && (caret.l_dir == TextServer::DIRECTION_AUTO || caret.l_dir == (TextServer::Direction)input_direction)) || (caret.t_caret == Rect2())) {
		ret.x = x_ofs + caret.l_caret.position.x + scroll_offset;
	} else {
		ret.x = x_ofs + caret.t_caret.position.x + scroll_offset;
	}
	
	if (ime_text.length() != 0) {
		if (ime_selection.y != 0) {
			caret = TS->shaped_text_get_carets(text_rid, caret_column + ime_selection.x + ime_selection.y);
		} else {
			caret = TS->shaped_text_get_carets(text_rid, caret_column + ime_text.size());
		}
		if ((caret.l_caret != Rect2() && (caret.l_dir == TextServer::DIRECTION_AUTO || caret.l_dir == (TextServer::Direction)input_direction)) || (caret.t_caret == Rect2())) {
			ret.y = x_ofs + caret.l_caret.position.x + scroll_offset;
		} else {
			ret.y = x_ofs + caret.t_caret.position.x + scroll_offset;
		}
	} else {
		ret.y = ret.x;
	}
	return ret;
}
void LineEdit::set_caret_mid_grapheme_enabled(const bool p_enabled) {