Renaming a lifecycle doesn't seem to work

I imported the HR vacation request project in my empty Studio project. Then I tried to rename the lifecycle provided by the project.
=> I get an error message saying: "Refactoring after rename failed. The rename was done but refactoring was not done (or partially done).".
=> the lifecycle name doesn't change in the Life Cycles list, nor on the life cycle edit form, or in the left menu.
=> After I do some other action that triggers a consistency check, I get a validation error on the document type that has this modified lifecycle. And when I want to select the lifecycle with the new name, it still displays the old name. So I keep the validation error.