You made an A/B Test within an Email Program, and now when you are in a smart list or smart campaign and are attempting to set up a filter (such as Opened Email), you are unable to locate the A/B test email asset in order to select it.
When an A/B test is made in an Email Program, the Program must be approved in order for the email to be located by other assets (smart lists/smart campaigns). Once the Program is approved, the email asset name will be changed to whatever kind of A/B test is used, and will be available for reference in other assets. For example:
[program name].Subject Line Test; or
[program name].Whole Email Test