The task detail pages for Prebuilt tasks include an option to search for previous tasks with the same signature as the selected Prebuilt task. Currently, the search is returning not only tasks that match the task name and the recipe of the Prebuilt task, but also other tasks for other recipes (most of the times, _setscene tasks). 

We have looked into the problem, and the matches are not the result of a data collection glitch in Toaster: the signatures for those tasks really are the same.

In order to provide only results that are relevant to the selected Prebuilt tasks, the search should check not only that the signature matches, but also that PN and task name match.