This is a reference entry from React error codes. A full explanation with fixes has not been written yet.
Cannot setState on regular state inside a startGestureTransition. Gestures can only update the useOptimistic() hook. There should be no side-effects associated with starting a Gesture until its Action is invoked. Move side-effects to the Action instead.
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Source: React error codes. Data fetched 2026-09-25T01:43:12.930Z.