@Tactical-Ochoa I know, it begins with the "comic book intro", it's a possibility, not a certainty. But what I meant was, Goodbye doesn't contradict anything from OS, and I personally think it offers a nice ending to OS showing the end of the summer and Ben and Gwen still fighting crime together, so I see no harm in taking it as canon to the OS timeline.
Maybe I'm wrong, but I personally think they made Goodbye a "What If" episode only because they wasn't sure if CN was going to give them a fifth season. So, if they had another season, they could still keep the summer vacations going and ignore Goodbye, but if they didn't get another season (which was the case), they still had a great final episode wrapping up the summer vacations and the series as a whole.