### Godot version

4.1.dev (dc625bcbfc5b587ba8867481ee7a1f6a567c25d0)

### System information

Mageia 9, Linux

### Issue description

When importing a project in current `master`, the following error is raised for each asset that gets imported:
```
Attempting to parent and popup a dialog that already has a parent.
```

It seems to be raised once per asset, caused by the progress dialog.

CC @bruvzg

### Steps to reproduce

- Import a new project in Godot that contains importable assets, e.g. https://github.com/RPicster/godot4-demo-desert-light

### Minimal reproduction project

See above.
ERR_FAIL_NULL_V_MSG(p_object, nullptr, "Object cannot be null.");
	Ref<Script> scr = p_object->get_script();
	if (scr.is_null() && p_object->is_class("Script")) {
		scr = p_object;
	}
	return _get_class_or_script_icon(p_object->get_class(), scr, p_fallback);
}
Ref<Texture2D> EditorNode::get_class_icon(const String &p_class, const String &p_fallback) {
	ERR_FAIL_COND_V_MSG(p_class.is_empty(), nullptr, "Class name cannot be empty.");
	Ref<Script> scr;
	if (ScriptServer::is_global_class(p_class)) {
		scr = EditorNode::get_editor_data().script_class_load_script(p_class);
	}
	return _get_class_or_script_icon(p_class, scr, p_fallback);
}
bool EditorNode::is_object_of_custom_type(const Object *p_object, const StringName &p_class) {