I'm using Unity 2020.3.2f1, Playmaker 1.9.1.p4, and Move Object works for me with sprites and 3D objects.
If it stopped working right after upgrading your project to a new version of Unity, then something probably got messed up while upgrading; You probably want to get a back-up of your project and try again.
Although, I'd check to see if Move Object works by testing it in an empty scene to see if it's something else that's wrong.
Hopefully someone else knows what's wrong though, and good luck.