The Bad Batch is Back in Star Wars: Sanctuary - Cover Art Reveal on StarWars.com (backup link) establishes that the events of Sanctuary: A Bad Batch Novel take place during season 2 of Star Wars: The Bad Batch, specifically after the episode "Pabu." As Clone Force 99 Is Back in New Star Wars: The Bad Batch Season 2 Trailer on StarWars.com (backup link) states that "Pabu" is the thirteenth episode of The Bad Batch Season 2, per the reasoning here, it and Sanctuary: A Bad Batch Novel must take place around 18 BBY.
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