UserStoreProvider was switching between three different return structures (LoadingSpinner / children directly / Context.Provider wrapping children), causing full fiber tree restructures in React 19 concurrent mode. When batched with other state updates (e.g. UpgradeBlockContext loading), React called insertBefore with a reference node already detached from the DOM. - Always render UserStoreContext.Provider so tree structure is stable; spinner vs children toggle happens inside it - Use useRef to hold a stable Zustand store (update via setState instead of recreating on every render) - Move inline <style> from App.tsx JSX into main.css to avoid React 19 style-tag edge cases with conditional sibling rendering Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com> |
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