diff --git a/backend/internal/session_manager/manager.go b/backend/internal/session_manager/manager.go
index f785f9968..97d91e5a7 100644
--- a/backend/internal/session_manager/manager.go
+++ b/backend/internal/session_manager/manager.go
@@ -919,7 +919,8 @@ func (m *Manager) RestoreAll(ctx context.Context) error {
 			continue
 		}
 		var ws ports.WorkspaceInfo
-		if project.Kind.WithDefault() == domain.ProjectKindWorkspace && len(rows) > 1 {
+		restoredWorkspaceProject := project.Kind.WithDefault() == domain.ProjectKindWorkspace && len(rows) > 1
+		if restoredWorkspaceProject {
 			projectRows, rowErr := m.sessionWorktreeRowsToRepoInfos(ctx, project, rec, rows)
 			if rowErr != nil {
 				m.logger.Error("restore-all: workspace rows failed", "sessionID", rec.ID, "error", rowErr)
@@ -994,8 +995,13 @@ func (m *Manager) RestoreAll(ctx context.Context) error {
 		if err := m.markSessionWorktreesActive(ctx, rows); err != nil {
 			m.logger.Warn("restore-all: marking worktrees active failed", "sessionID", rec.ID, "error", err)
 		}
-		if err := m.store.DeleteSessionWorktrees(ctx, rec.ID); err != nil {
-			m.logger.Error("restore-all: delete consumed worktree marker failed", "sessionID", rec.ID, "error", err)
+
+		// One-shot: drop the consumed marker so it never outlives one restart
+		// (#2319). A still-live session re-acquires it at the next quit.
+		if !restoredWorkspaceProject {
+			if err := m.store.DeleteSessionWorktrees(ctx, rec.ID); err != nil {
+				m.logger.Warn("restore-all: delete restore marker failed", "sessionID", rec.ID, "error", err)
+			}
 		}
 	}
 	return nil
diff --git a/backend/internal/session_manager/manager_test.go b/backend/internal/session_manager/manager_test.go
index 304219bd8..c3829a93e 100644
--- a/backend/internal/session_manager/manager_test.go
+++ b/backend/internal/session_manager/manager_test.go
@@ -2457,6 +2457,23 @@ func TestRestoreAll_WorkspaceProjectRestoresAndAppliesEachRepo(t *testing.T) {
 	if rt.created != 1 {
 		t.Fatalf("runtime.Create calls = %d, want 1", rt.created)
 	}
+	rows, err := st.ListSessionWorktrees(ctx, "mer-1")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(rows) != 2 {
+		t.Fatalf("workspace project rows after RestoreAll = %v, want root and child inventory", rows)
+	}
+	states := map[string]string{}
+	for _, row := range rows {
+		states[row.RepoName] = row.State
+		if row.PreservedRef != "" {
+			t.Fatalf("row %s preserved_ref = %q, want consumed", row.RepoName, row.PreservedRef)
+		}
+	}
+	if states[domain.RootWorkspaceRepoName] != "active" || states["api"] != "active" {
+		t.Fatalf("workspace project row states = %v, want active inventory", states)
+	}
 }
 
 func TestReconcileLive_DeadSessionStashedAndTerminated(t *testing.T) {