Problem with esc's recieved

Hello all, I’m a novice who has decided to enter into the drone community. So I’ve ordered the vtail-500 , which came with 4 ESCs (T18A), however, I have come upon a pretty annoying problem. The red and black wires on one of the ESCs are exposed, unlike the other three which have a plug to connect it to the 4 harnesses. Is this intentional? Should I just wrap it with electrical tape? Sorry if this sounds like a newb question, it’s been seriously tripping me up.

Thanks!

Can you post a picture of that ESC ?
Usually you should have all identical ESC’s with the Dean plug.