Even though many of Roseanne’s recurring stars cropped up throughout The Conners, the spinoff dropped at least one intriguing figure with no explanation. The Conners had a hard time continuing the story of 2017’s Roseanne revival. When Roseanne season 10 aired, the show was able to revisit the Conner family without changing much about their usual dynamic. However, when series star Roseanne Barr was fired due to racist tweets, The Conners needed to kill her off and radically reshape the sitcom’s story by focusing on her grieving family. Inevitably, this meant that some of Roseanne’s supporting stars were jettisoned.

https://screenrant.com/the-conners-roseanne-crystal-character-disappeared/