In Illustrator version 2.1 (macOS Catalina 10.15.3) as well as whatever the most previous version of Illustrator was I have been experience an issue where after undoing a point movement of a shape with the direct selection point, further transformations to the point can nor be made. If I attempt to move the point (or any points on the shape in question) they snap back to their previous positions. The only solution I have found is to cut the object and baste it again, where after further point transformations will work. This is a tedious work around in work with lots of layered objects and occurs frequently throughout the day in different files.