Hi,
Adobe Target Premium and standard sits on the same foundational platform as classic so there should not be any issues unless there is a change in your implementation.
We would recommend you to reach out to Adobe Target customer care they can surely help you debugging the same. Please see the following link for information on reaching out to customer care
Please note that only supported user for a company account can reach out to Customer care. If you are not a supported user for your company account, Please reach out to your Account Manager.
Regards
Parit Mittal