If you run your stream for longer than 8 hours, it's considered as Continious Broadcast. Continuous live will not generate a VOD. Once the broadcast ends, the post will be unpublished from the timeline, which means only the broadcast owner will see it.
If your stream was less than 8 hours, and it still had dissapeared, it could happen for the following reasons:
- When you stream something what violates FB policy (f.e. like copyrighted content).
- You logged out from your FB completely and Livereacting could lose access to your account, so the stream had stopped.
- Someone who has access to your FB page could stop the stream manually.