When Dark Phoenix hits theaters next month, it’ll be with an ending that’s significantly different from the one writer/director Simon Kinberg originally intended. We learned last summer that the X-Men movie was going back to Montreal for reshoots, but sources told us at the time that contrary to reports of a whopping three months of additional photography, they were simply going back for two and a half weeks of reshoots to work on the third act. While at the time sources told us these reshoots weren’t extensive, it appears that may not have been exactly …