DaVinci Resolve - transitions and effects problem, how to make effects not disappear?

Question

Video

I have a question for those people who have worked or are working in DaVinci Resolve (software for editing, if anything). The problem is the following, I could not overcome different versions and reinstallation. If there are two subclips, and on one of them, let's say, if it is vertically thrown with the effect of filling black lines on the sides (what would be a blurred stretched video) and then connect this subclip to the other nearby with some kind of video transition, then the effect of filling black lines simply disappears for a second , it looks like in the screenshot (the second one clearly shows what the salt is). While this applies to any effects and transitions, including audio tracks suffer in the same way if you work with them separately to add a transition.