Doing some screen replacements, and in it, I use a planar track + corner pin to make a garbage matte inside the screen to remove tracking markers.
This works fine on some playbacks, but on others, the corner pin will make the mask small out of nowhere for no reason I can figure out.
I'm thinking this is a bug but I'm not sure
Node Tree
Bugged Output
Correct Output
The bugged and correct output images are literally the same fame, only difference is I moved up a frame and then came back.