Keyframe stretcher not working on fusion effect template

I try to use the time stretcher for a simple effect that will zooms in at the beginning of the clip and zooms out at the end. I have set the keyframes (animation of 10 frames at the beginning and 10 frames at the end) and the animation works fine. Then i add the keyframe stretcher juste after my stransform node and before the Media Out node. I have set the source end at 100 (my clip is 4sec 25fps), the stretch start at 11 and the stretch end at 89. But then, what happens is that the end animation just disappears. What am i doing wrong?
I can use the keyframe stretcher without any issue with titles or generators. Is that not working for effects?

i have made a new discovery. If the entire clip is used (no trim at all), the keyframe stretcher does it's job, but i can't reduce the length of the clip otherwise i will loose the end animation. In other words, the keyframe stretcher is not responsive when i modify the length of a clip or if i apply it to a trimmed clip. It just adapt to the duration of an entire clip. Is that normal?

i have made a new discovery. If the entire clip is used (no trim at all), the keyframe stretcher does it's job, but i can't reduce the length of the clip otherwise i will loose the end animation. In other words, the keyframe stretcher is not responsive when i modify the length of a clip or if i apply it to a trimmed clip. It just adapt to the duration of an entire clip. Is that normal?

It happens to me as well. Really bad node. I opened today a topic about.