I have found that with the new version 3 there are problems when using keyframes, especially in different elements that are in different layers but in the same timeline.
For example, video on layer 1; enter "Title A" in layer 2 and at the same time enter "Title B" in layer 3; they both have different actions with keyframes. In the preview I can see the effect well, but the end result is different, even optimizing the project. I include a link as example, so you can see what happens with the titles. Also I have another problem with a video using keyframes to zoom along with the blur effect.
IPad Pro 10.5 (iOS 14.7.1)