From The Hollywood Reporter:
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Much of the cast and director Gareth Edwards will regroup in mid-June for another round of shooting. The move is happening after execs screened the film and felt it was tonally off with what a “classic” Star Wars movie should feel like. The pic has not yet been tested before audiences, but one source describes the cut as having the feel of a war movie.
The goal of the reshoots will be to lighten the mood, bring some levity into the story and restore a sense of fun to the adventure.