This looks like there is a shadow copy of the Sk class with the old name still around. Look into your
Project-Generated-BP overlay folder and see if you spot a folder name named like the previous name of your BP asset. If so, delete it, that should fix the problem.
We will also shortly roll out a feature where you can suppress certain BP classes from being reflected to Sk. So if there's a class that causes trouble with Sk but that you actually don't need in Sk, you can simply exclude it from Sk. This will be in the next release.