### 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.
project_run_bar->stop_child_process(p_pid);
}
Ref<Script> EditorNode::get_object_custom_type_base(const Object *p_object) const {
	ERR_FAIL_COND_V(!p_object, nullptr);
	Ref<Script> scr = p_object->get_script();
	if (scr.is_valid()) {
		
		
		
		
		
		
		StringName base = scr->get_instance_base_type();
		if (base != StringName() && EditorNode::get_editor_data().get_custom_types().has(base)) {
			const Vector<EditorData::CustomType> &types = EditorNode::get_editor_data().get_custom_types()[base];
			Ref<Script> base_scr = scr;
			while (base_scr.is_valid()) {
				for (int i = 0; i < types.size(); ++i) {
					if (types[i].script == base_scr) {
						return types[i].script;
					}
				}
				base_scr = base_scr->get_base_script();
			}
		}
	}
	return nullptr;
}
StringName EditorNode::get_object_custom_type_name(const Object *p_object) const {