I have used Trace Matte to hide faces in a sequence. In order to do more than one person the sequence includes multiple Matte Tracks.
When I use the dip to black transition I am getting a fade to black and also seeing the mosaic then it goes to the next sequence. making the transition jerky.
If I remove all of the dip to black transitions that sequences all cleanly change.
Any suggestions to fix this would be appreciated.
If I am understanding your post correctly I would nest the tracks together and then apply one dip to black transition
to that nested sequence.
Using transitions on multiple stacked clips can lead to some unwanted results, since you're changing the opacity of multiple layers at once, instead of en masse. Nesting would work, but then you'd need to extend the footage in your nests to create handles.
The simple way to do it is to create a piece of Black Video (File > New > Black Video), add it on a track above the transition point, and then create opacity animation up and down on it, or just add cross dissolves. The result is a dip to black that will not change the opacity of the underlying layers--it's fading black in and out over the layers.