Track matte transitions do not work on sources added to vertical DSK

[jenks6797]

Steps to reproduce:

1. Add a color source to a new vertical scene, let's call it "Test Scene"
2. Add a "Show Transition" to that color source using track matte. Show and hide the source and notice that the transition should work fine.
3. Add "Test Scene" to the vertical DSK so that it shows up in every scene now.
4. Go to any other vertical scene and show/hide the color source. The transition should not work now.

This issue does not happen with the regular/horizontal DSK. Also, it only seems to happen with track matte transitions. If you follow my steps but use "Swipe" for example, everything works fine.

[jenks6797]

Just checking back in to see if you were able to recreate this issue.