I’ve had this happen also but only with the character movement component. I fixed it by changing the class of my character BP to Actor, save and close editor. Reopen editor, go to character and change the class back to Character. Close and reopen again and it should be there.
If you’re unsure how to change the class, click on Class Settings in the top right corner of the character BP there should be an option to change the Class or reparent (I can’t remember the exact wording) that hopefully will do the trick