### 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)

Ref<StyleBox> style = theme_cache.normal;
	Ref<Font> font = theme_cache.font;
	int font_size = theme_cache.font_size;
	Size2 min_size;
	
	float em_space_size = font->get_char_size('M', font_size).x;
	min_size.width = theme_cache.minimum_character_width * em_space_size;
	if (expand_to_text_length) {
		
		min_size.width = MAX(min_size.width, full_width + theme_cache.caret_width);
	}
	min_size.height = MAX(TS->shaped_text_get_size(text_rid).y, font->get_height(font_size));
	
	int icon_max_width = 0;
	if (right_icon.is_valid()) {
		min_size.height = MAX(min_size.height, right_icon->get_height());
		icon_max_width = right_icon->get_width();
	}
	if (clear_button_enabled) {
		min_size.height = MAX(min_size.height, theme_cache.clear_icon->get_height());
		icon_max_width = MAX(icon_max_width, theme_cache.clear_icon->get_width());
	}
	min_size.width += icon_max_width;
	return style->get_minimum_size() + min_size;
}
void LineEdit::deselect() {