Block update - breaks content visibility for List with horizontal sliding cards

By selecting the update (structural changes?) to the list: “List with horizontal sliding cards” the contents are no longer visible to users.

I was alerted to this by a user; they were not seeing full details as expected (for a record with linked items). I had updated two blocks (now invisible to the user) and a third block remained visible (with exactly the same conditions). When I updated the third block just now, it too becomes invisible to the user.

@MarkSchofield can you pls DM in a chat so we could figure out the use case and check ?

@artur If I add a new (identical) block and set it up the same, it works … issue must be with updating a previous block