I have given a shortcut to each scale preset I create:
100% to 110% > f8
110% to 100% > f9
50% to 60% > f10
60% to 50% > f11
Whenever I need to apply the preset, I select the clip and hit the shortcut. In case of f9, this generates a
keyframe on the first frame with the scale at 110% and a keyframe on the last frame of the clip with the scale at 100%.
What I noticed, is that when I hit the shortcut of the last three preset above described, they always apply to a clip (ie the animation generates correctly) while when I hit f8 it sometimes (1 out of 10 times) does not apply. In case it does not apply, two things may happen:
1) no keyframes generate
2) only the first keyframe generate
On the clip where f8 does not work, the other presets work correctly. It's just that 100% to 110%.
I have also noticed that this issue happens only on nested or multicam clips.
I will take a video next time it happens so it can be helpful to understand better.