Yes, working as intended.
You can read the full update here: 6.9 Update: Trials of the Conqueror
But the bit you’re referring to is stated here:
- After completing an Epic Trial Battle, players will be given an offer to purchase additional copies of the Starry Pet for Gems.
- Players will be able to replay the Epic Trial Battles in a Kingdom, starting from the first one again, each time that Kingdom is a weekly Kingdom.
Basically, you must now wait until the kingdom comes around again.