Harmony (Trial) - Envelope Deformer Bug?

I very recently began to test out Harmony (trial) after using Animate for a few months. I was following Oli’s Cat Class tutorial involving Killgar and arrived at the part where he uses the envelope deformer. Tutorials show that the tool should be a simple click and drag path, however when I use the tool, the second click results in a loop to the original point, and it makes the tool impossible to use. I’m not sure if this is just a bug or if I’m using it wrong but I can’t seem to find resourced on it. I’m currently using the latest version (17727). Here’s a video showing what happens.

Here is a video on using the envelope deformation, hope this helps you out. ZeBirdBrain has tons of Harmony tutorials, enjoy.