There are some issues when you upgrade the Dev environment and you have custom Business Process Flows (BPF) and when you export the solution with that BPF as manage and import in the Test/Prod environment but it is giving an error. This is because the prefix of the BPF is with “new_” instead of the prefix of the solution.
There is a known article that explains how to solve the issue:
Following the steps will help you to overcome this issue without having to open a support ticket or running scripts directly in the DB.
Have in mind that these steps are to be performed in the sandbox that there isn’t any problem deleting the BPF so the records related to that are all deleted.
Hope this helps.