Is Subgraph Unpacking Broken?

Hi,

I am using the latest version of Comfyui portable. I noticed that there is no way for me to unpack a subgraph. As you can see from the screenshot, if I hit the "unpack" icon on the subgraph, I get an error: "can't access property "type", r.graph.links[y] is undefined." And, if I hit right click=>unpack subgraph, nothing happened.

Is this feature broken? Or, am I doing something wrong?

https://preview.redd.it/82gqrelyin4g1.png?width=805&format=png&auto=webp&s=d84fda62e2a590e2364fe878b280114a6b8552cd