missing snapshot when the stream ownership is changed.

My understanding is that the visibility of a snapshot is determined by the visibility of the owner of that snapshot.   So if you can see the owning stream, you should be able to see that snapshot.   But if the ownership of the snapshot is changed to a different stream, and you do not have read access to that new stream, then I would expect you to no longer be able to see that snapshot.   If you want to still be able to see that snapshot, then you either need to be given read access to the new owning stream, or the owner of that snapshot needs to be reassigned to a stream to which you do have read access.