An extension can be both video and panel.
Both the same extension cannot be active in both video and panel at the same time.
The logic is that an extension does one thing, but could offer a different view if active in the other position.
But if an extension is supposed to be active in both slots you should have a “partner” extension to your extension. Afaik it’s to do with how PubSub works for an extension. Since you’ll proabably want to send different data at different rates to the extension in a given slot