Published onDecember 31, 2025The True Behavior and Design Tradeoffs of ISR in Next.js App Router: Why Your Pages Aren't UpdatingNext.jsISRCachingRenderingContent-EngineeringArchitecture-Trade-offsDeconstructing how ISR truly works in the Next.js App Router to clarify the root cause of 'why pages don't update despite data changes.' Understand ISR's…