I was about to create a post about this same issue without checking if it was already pointed. Good thing I did check! HA!
Both in the designer’s components tree or in the blocks components tree, if you have enough components to fill the tree space and you have to scroll up and down to see them all, when you click on a component, the tree view is reset to the top, it’s scrolled all the way up, when it should stay where it is.
In MIT App Inventor they fixed it in the last or the previous update. Not an urgent fix, for sure but It’s really a very annoying behavior.