I gave the demo a try and was able to run a search that showed "51 results" - great start! A few things I noticed though:
On the Data tab it says "no schema defined yet."
The Schema tab doesn’t seem to have a way to create a schema.
Most of the other tabs (except for Sources) looked blank.
I did see the chat on the right and the "51 items" counter at the top, but I couldn’t find any obvious way to view the results in a grid or table.
Could you share the session url via the feedback form if you still have access to it?
That's really strange, it sounds like Webhound for some reason deleted the schema after extraction ended, so although your data should still be tied to the session it just isn't being displayed. Definitely not the expected behavior.