diff --git a/Sources/RDReaderView/EPUBUI/ReaderController/RDEPUBPageMapReconciliationCoordinator.swift b/Sources/RDReaderView/EPUBUI/ReaderController/RDEPUBPageMapReconciliationCoordinator.swift
index fc57fc6..99a3430 100644
--- a/Sources/RDReaderView/EPUBUI/ReaderController/RDEPUBPageMapReconciliationCoordinator.swift
+++ b/Sources/RDReaderView/EPUBUI/ReaderController/RDEPUBPageMapReconciliationCoordinator.swift
@@ -28,8 +28,10 @@ final class RDEPUBPageMapReconciliationCoordinator {
 
         guard let currentWindow else {
             if let candidatePageMap {
+                RDEPUBBackgroundTrace.log("Reconciliation", "evaluateTakeover: no currentWindow, fullReplace candidateChapters=\(candidatePageMap.totalChapters) candidatePages=\(candidatePageMap.totalPages)")
                 return .fullReplace(candidatePageMap)
             }
+            RDEPUBBackgroundTrace.log("Reconciliation", "evaluateTakeover: no currentWindow, no candidate")
             return .keepCurrentWindow
         }
 
@@ -54,7 +56,7 @@ final class RDEPUBPageMapReconciliationCoordinator {
                     if coverageRatio < 0.8 {
                         RDEPUBBackgroundTrace.log(
                             "Reconciliation",
-                            "blocked: candidate doesn't cover protected area (coverage=\(coverageRatio))"
+                            "evaluateTakeover: blocked by jumpSession protection coverage=\(String(format: "%.2f", coverageRatio)) currentSpine=\(currentSpineIndex) protected=\(protectedIndices)"
                         )
                         return .keepCurrentWindow
                     }
@@ -72,7 +74,7 @@ final class RDEPUBPageMapReconciliationCoordinator {
                     if !hasPrev || !hasNext {
                         RDEPUBBackgroundTrace.log(
                             "Reconciliation",
-                            "blocked: missing adjacent chapter coverage"
+                            "evaluateTakeover: blocked by missing adjacent coverage (segment) currentSpine=\(currentSpineIndex) hasPrev=\(hasPrev) hasNext=\(hasNext)"
                         )
                         return .keepCurrentWindow
                     }
@@ -85,7 +87,7 @@ final class RDEPUBPageMapReconciliationCoordinator {
             if candidateSegment.renderSignature != currentRenderSignature {
                 RDEPUBBackgroundTrace.log(
                     "Reconciliation",
-                    "blocked: render signature mismatch"
+                    "evaluateTakeover: blocked by render signature mismatch"
                 )
                 return .keepCurrentWindow
             }
@@ -109,6 +111,7 @@ final class RDEPUBPageMapReconciliationCoordinator {
             )
         }
 
+        RDEPUBBackgroundTrace.log("Reconciliation", "evaluateTakeover: no candidate, keepCurrentWindow")
         return .keepCurrentWindow
     }
 
@@ -123,6 +126,10 @@ final class RDEPUBPageMapReconciliationCoordinator {
 
         if let currentSpineIndex {
             if !candidateIndices.contains(currentSpineIndex) {
+                RDEPUBBackgroundTrace.log(
+                    "Reconciliation",
+                    "evaluateSegmentTakeover: keepCurrentWindow — currentSpine=\(currentSpineIndex) not in candidate"
+                )
                 return .keepCurrentWindow
             }
         }
@@ -132,6 +139,10 @@ final class RDEPUBPageMapReconciliationCoordinator {
             let hasNext = candidateIndices.contains(currentSpineIndex + 1) ||
                 currentSpineIndex == lastBuildableSpineIndex
             if !hasPrev || !hasNext {
+                RDEPUBBackgroundTrace.log(
+                    "Reconciliation",
+                    "evaluateSegmentTakeover: keepCurrentWindow — missing adjacent spine=\(currentSpineIndex) hasPrev=\(hasPrev) hasNext=\(hasNext)"
+                )
                 return .keepCurrentWindow
             }
         }
@@ -164,9 +175,14 @@ final class RDEPUBPageMapReconciliationCoordinator {
         lastBuildableSpineIndex: Int
     ) -> RDEPUBPageMapTakeoverDecision {
         let candidateIndices = Set(candidatePageMap.entries.map { $0.spineIndex })
+        let currentEntries = currentWindow.entries.count
 
         if let currentSpineIndex {
             if !candidateIndices.contains(currentSpineIndex) {
+                RDEPUBBackgroundTrace.log(
+                    "Reconciliation",
+                    "evaluateFullPageMapTakeover: keepCurrentWindow — currentSpine=\(currentSpineIndex) not in candidate (candidateChapters=\(candidateIndices.count) currentChapters=\(currentEntries) candidatePages=\(candidatePageMap.totalPages) currentPages=\(currentWindow.totalPages))"
+                )
                 return .keepCurrentWindow
             }
         }
@@ -176,15 +192,27 @@ final class RDEPUBPageMapReconciliationCoordinator {
             let hasNext = candidateIndices.contains(currentSpineIndex + 1) ||
                 currentSpineIndex == lastBuildableSpineIndex
             if !hasPrev || !hasNext {
+                RDEPUBBackgroundTrace.log(
+                    "Reconciliation",
+                    "evaluateFullPageMapTakeover: keepCurrentWindow — missing adjacent spine=\(currentSpineIndex) hasPrev=\(hasPrev) hasNext=\(hasNext) lastBuildable=\(lastBuildableSpineIndex)"
+                )
                 return .keepCurrentWindow
             }
         }
 
-        let isComplete = candidateIndices.count >= currentWindow.entries.count
+        let isComplete = candidateIndices.count >= currentEntries
         if isComplete {
+            RDEPUBBackgroundTrace.log(
+                "Reconciliation",
+                "evaluateFullPageMapTakeover: fullReplace — candidateChapters=\(candidateIndices.count) currentChapters=\(currentEntries) candidatePages=\(candidatePageMap.totalPages) currentPages=\(currentWindow.totalPages)"
+            )
             return .fullReplace(candidatePageMap)
         }
 
+        RDEPUBBackgroundTrace.log(
+            "Reconciliation",
+            "evaluateFullPageMapTakeover: keepCurrentWindow — candidateChapters=\(candidateIndices.count) < currentChapters=\(currentEntries)"
+        )
         return .keepCurrentWindow
     }
 
diff --git a/Sources/RDReaderView/EPUBUI/ReaderController/RDEPUBPresentationRuntime.swift b/Sources/RDReaderView/EPUBUI/ReaderController/RDEPUBPresentationRuntime.swift
index 433116c..c68f61e 100644
--- a/Sources/RDReaderView/EPUBUI/ReaderController/RDEPUBPresentationRuntime.swift
+++ b/Sources/RDReaderView/EPUBUI/ReaderController/RDEPUBPresentationRuntime.swift
@@ -226,7 +226,8 @@ final class RDEPUBPresentationRuntime {
 
             switch decision {
             case .keepCurrentWindow:
-                RDEPUBBackgroundTrace.log("Reconciliation", "decision: keepCurrentWindow")
+                RDEPUBBackgroundTrace.log("Reconciliation", "decision: keepCurrentWindow — pending update removed to prevent indefinite retry")
+                removePendingPageMapUpdate(at: index)
                 return false
 
             case .fullReplace(let newPageMap):