The default Glitch animation is an example of this.

Consider this timeline depiction:

[ --- Video 2 --- ][ --- Video 3 --- ]
[ ------------ Video 1 ------------- ]

Video 1 is "below", on a lower track, than videos 2 and 3. It's serving as the background.

Video 2 and 3 are clips of "talking heads", cropped and scaled to only take up room in the top right corner.

If I apply the Glitch transition between Video 2 and 3... it also affects the content of Video 1.

I've tried also doing this by combining Video 2/3 in a compound clip and applying the transition within the compound clip... but then when I import the compound clip on top of Video 1... I still see the glitch effect affect Video 1.

I've also tried using an adjustment clip to mimic the transition, within the compound clip for VIdeo 2/3... and still when I bring the compound clip to the main timeline, the adjustment clip also affects Video 1.

• Why is this the behavior of many transitions (to include the Glitch effect)?
• Is there a way to prevent this, so that the transition only affects video 2/3, without affecting lower tracks?

(This is for Davinci 18.1, if it matters)