### Godot version

v4.0.beta.custom_build [eaf306e0b]

### System information

Windows 10

### Issue description

Selecting a `Window` node in the Editor's SceneTree results in the message
```
editor/editor_data.cpp:1058 - Parameter "p_node" is null.
```
and the Inspector shows empty content instead of the Window's properties.

I would expect, that clicking on a node in the SceneTree lets me edit the properties of the node.

Bisecting shows that this behavior got introduced in #71770

### Steps to reproduce

1. Create a Window node
2. Click on the Window node in the Editor's SceneTree

### Minimal reproduction project

N/A
Dictionary d = p_data;
	if (d.has("type")) {
		if (String(d["type"]) == "files") {
			Vector<String> files = d["files"];
			bool can_instantiate = false;
			List<String> scene_extensions;
			ResourceLoader::get_recognized_extensions_for_type("PackedScene", &scene_extensions);
			List<String> texture_extensions;
			ResourceLoader::get_recognized_extensions_for_type("Texture2D", &texture_extensions);
			for (int i = 0; i < files.size(); i++) {
				String extension = files[i].get_extension().to_lower();
				// Check if dragged files with texture or scene extension can be created at least once.
				if (texture_extensions.find(extension) || scene_extensions.find(extension)) {
					Ref<Resource> res = ResourceLoader::load(files[i]);