I do many migrations and generally no errors. I’m working on smaller projects, for example AI only, animation only etc, then I migrate it to my main project, game project.
I have no errors mostly, but what you should know, project settings (and editor preferences) are not migrated. If you had changed project settings - for example inputs, physic settings, ai settings, navigation. Simply, your blueprint can have broken input action - like a crouch or other. You can start with checking project settings in both projects.
edit.
Of course other problems can come when you migrate from/to different engine versions - not always, but possible