[BUG] Output node not working

Output node did not preview the group output

1. Create a node group
2. After saving and modify or add a new output to the output node
3. It is not displaying the output while set preview

*It was working fine until I added a new output node to the output group node and the node until the set preview before the output node works fine


**Desktop (please complete the following information):**
- OS: Windows 10
- Blender Version 2.83.1
- Sorcar Version 3.2

FIX I USE
* I used to copy and repaste the whole tree in another group
* Can someone tell how to add the output node back if deleted