I have just had a meeting with two of our users who have admin right for the workspaces which is in premium,they don’t have any tenant/capacity admin rights but They were able to change the capacity from the workspace context.
I have tested on my side, it works well.
Try to restart capacity see if it works, if other admin users could change the capacity from the workspace context? and make sure these two users are not assigned the admin in one group by accident.
thank You for Your advice, unfortunately I still receive below error message when trying to refresh the dataset.