BUG - Failed renaming test case deletes content

I believe you haven’t tested a case where you have subfolders under the Test Case. Katalon Studio can not manages subfolders under the Test Cases folder properly.

Please follow the steps I described at

No I wouldn’t. Making a movie is tiresome. The above GitHub repository has the branches step1, step2, step3 and step4; which you can easily checkout and see. That should be enough.