I had the same question, which is how I found this post… Then I found our B-test creative. Our A/B tested page has a form on it, and the page (both A and B, though A variation won out) is still visible through a preview link in the forms section under where the form is being used. Not sure if this is relevant, but it seems like the cross references like these don’t go away, just because the B-test is no longer accessible under the landing page option.