diff --git a/apps/web/src/persistenceSchema.test.ts b/apps/web/src/persistenceSchema.test.ts
index 385f0e700a8c532beb0c28c7ecb657a9b8fbd59c..2b7b951c8d856c5491138cd95cff312fe980fb96 100644
--- a/apps/web/src/persistenceSchema.test.ts
+++ b/apps/web/src/persistenceSchema.test.ts
@@ -264,7 +264,7 @@ describe("hydratePersistedState", () => {
     expect(hydrated?.threads[0]?.activeTerminalGroupId).toBe(`group-${DEFAULT_THREAD_TERMINAL_ID}`);
   });
 
-  it("hydrates persisted turn diff summaries", () => {
+  it("hydrates persisted turn diff summaries and clears persisted loaded flags", () => {
     const payload = JSON.stringify({
       version: 7,
       runtimeMode: "full-access",
@@ -313,7 +313,6 @@ describe("hydratePersistedState", () => {
         turnId: "turn-1",
         completedAt: "2026-02-08T10:05:00.000Z",
         checkpointTurnCount: 1,
-        checkpointDiffLoaded: true,
         files: [
           {
             path: "src/app.ts",
@@ -417,7 +416,6 @@ describe("toPersistedState", () => {
           completedAt: "2026-02-08T10:05:00.000Z",
           status: "completed",
           checkpointTurnCount: 1,
-          checkpointDiffLoaded: true,
           files: [
             {
               path: "src/app.ts",
@@ -493,7 +491,6 @@ describe("toPersistedState", () => {
           completedAt: "2026-02-08T10:05:00.000Z",
           status: "completed",
           checkpointTurnCount: 1,
-          checkpointDiffLoaded: true,
           files: [
             {
               path: "src/app.ts",
diff --git a/apps/web/src/persistenceSchema.ts b/apps/web/src/persistenceSchema.ts
index afc083839bf9ecc61722f363ca75092fdfa58b85..2f65a0f1987b40c406e9b283e005a46a123dac66 100644
--- a/apps/web/src/persistenceSchema.ts
+++ b/apps/web/src/persistenceSchema.ts
@@ -305,7 +305,6 @@ function hydrateThread(
       ...(typeof summary.checkpointTurnCount === "number"
         ? { checkpointTurnCount: summary.checkpointTurnCount }
         : {}),
-      ...(summary.checkpointDiffLoaded ? { checkpointDiffLoaded: true } : {}),
     })),
   };
 }
@@ -401,7 +400,6 @@ export function toPersistedState(
         ...(typeof summary.checkpointTurnCount === "number"
           ? { checkpointTurnCount: summary.checkpointTurnCount }
           : {}),
-        ...(summary.checkpointDiffLoaded ? { checkpointDiffLoaded: true } : {}),
       })),
     })),
     activeThreadId: state.activeThreadId,