https://www.gamespot.com/articles/fortnite-on-switch-is-having-update-problems-updat/1100-6462129/

Epic Games has released an update for Fortnite that is intended to address the unintended breast jiggle physics that appeared after the Season 6 launch. According to the developer, the update contains fixes for "item and animation issues," but Nintendo Switch players are reporting that it has also made the game unplayable for them.

[Update: An Epic Games representative has said the issue has now been resolved.]