diff --git a/lib/tdeck_ui/Hardware/TDeck/MapTileStore.cpp b/lib/tdeck_ui/Hardware/TDeck/MapTileStore.cpp
index e6702772..b212c884 100644
--- a/lib/tdeck_ui/Hardware/TDeck/MapTileStore.cpp
+++ b/lib/tdeck_ui/Hardware/TDeck/MapTileStore.cpp
@@ -597,6 +597,15 @@ TileStoreResult MapTileStore::finishPut() {
         return result;
     }
     const bool transactional_eviction = victim_count != 0U;
+    if (duplicate) {
+        // A stale backup must not become the rollback generation recorded by a
+        // new transaction. Verify its removal before publishing the manifest.
+        result = storage_.remove(put_backup_);
+        if ((result != TileStoreResult::OK) && (result != TileStoreResult::MISS)) {
+            storage_.remove(put_temp_);
+            return result;
+        }
+    }
     if (transactional_eviction) {
         result = writeEvictionTransaction(put_key_, duplicate, victims, victim_count);
         if (result != TileStoreResult::OK) {
@@ -605,7 +614,6 @@ TileStoreResult MapTileStore::finishPut() {
         }
     }
     if (duplicate) {
-        storage_.remove(put_backup_);
         result = storage_.rename(put_live_, put_backup_);
         if (result != TileStoreResult::OK) {
             if (transactional_eviction) recoverEvictionTransaction();
diff --git a/tests/native/test_map_tile_store.cpp b/tests/native/test_map_tile_store.cpp
index da98a09a..2bc17013 100644
--- a/tests/native/test_map_tile_store.cpp
+++ b/tests/native/test_map_tile_store.cpp
@@ -231,6 +231,12 @@ void testDuplicateEvictionPowerCutsRestoreOldCandidateAndVictim() { beginTest();
         drain(recovered,a,40U); drain(recovered,b,40U);
     }
 }
+void testStaleDuplicateBackupMustClearBeforeManifest() { beginTest(); FakeStorage fs; MapTileStore s(fs,config(2U,80U,80U)); CHECK(s.initialize()==TileStoreResult::OK);
+    const TileKey a={1U,0U,0U}, b={1U,1U,0U}; CHECK(put(s,a,png())==TileStoreResult::OK); CHECK(put(s,b,png())==TileStoreResult::OK);
+    fs.add("/pyxis-map/tiles/1/0/0.png.bak",png(60U)); fs.fail_remove_path="/pyxis-map/tiles/1/0/0.png.bak";
+    CHECK(put(s,a,png(80U))==TileStoreResult::IO_ERROR); fs.fail_remove_path.clear();
+    CHECK(s.entryCount()==2U); CHECK(s.totalBytes()==80U); drain(s,a,40U); drain(s,b,40U);
+}
 void testMalformedEvictionManifestFailsClosed() { beginTest(); FakeStorage fs;
     fs.add("/pyxis-map/tiles/.evict.txn",std::vector<std::uint8_t>(21U,0U));
     MapTileStore s(fs,config()); CHECK(s.initialize()==TileStoreResult::INDEX_MISMATCH);
@@ -249,4 +255,4 @@ void testDeterministicStress() { beginTest(); FakeStorage fs; MapTileStore s(fs,
     std::uint32_t size=0U; for(std::uint32_t i=0U;i<100000U;++i) { const TileKey k={2U,i&3U,(i>>2)&3U}; TileStoreResult r=s.beginGet(k,size); CHECK(r==TileStoreResult::OK||r==TileStoreResult::MISS); if(r==TileStoreResult::OK)s.endGet(); }
 }
 }
-int main() { testKeyAndCanonicalPath(); testMissHitAndRemoval(); testMalformedPngs(); testShortWriteAbortsTemp(); testExactQuotaAndLruEviction(); testDuplicateAtomicReplacement(); testInterruptedFilesRecover(); testLiveWinsRecovery(); testCorruptLiveRecoversValidBackup(); testCorruptLiveWithoutBackupIsRemoved(); testStaleTempRemovalFailureAbortsPut(); testRecoveryRejectsMalformedAndExhaustion(); testRecoveryQuotaFailsClosed(); testRenameFailureRestoresDuplicate(); testPromotionFailureDoesNotEvictVictims(); testEvictionPreflightFailurePreservesAllVictims(); testEvictionStageFailureRollsBackAllVictims(); testEvictionPowerCutsRestoreWholeOldGeneration(); testDuplicateEvictionPowerCutsRestoreOldCandidateAndVictim(); testMalformedEvictionManifestFailsClosed(); testPostCommitCleanupResidueKeepsWholeNewGeneration(); testDeterministicStress(); std::cout<<"map tile store: "<<tests_run<<" tests passed\n"; }
+int main() { testKeyAndCanonicalPath(); testMissHitAndRemoval(); testMalformedPngs(); testShortWriteAbortsTemp(); testExactQuotaAndLruEviction(); testDuplicateAtomicReplacement(); testInterruptedFilesRecover(); testLiveWinsRecovery(); testCorruptLiveRecoversValidBackup(); testCorruptLiveWithoutBackupIsRemoved(); testStaleTempRemovalFailureAbortsPut(); testRecoveryRejectsMalformedAndExhaustion(); testRecoveryQuotaFailsClosed(); testRenameFailureRestoresDuplicate(); testPromotionFailureDoesNotEvictVictims(); testEvictionPreflightFailurePreservesAllVictims(); testEvictionStageFailureRollsBackAllVictims(); testEvictionPowerCutsRestoreWholeOldGeneration(); testDuplicateEvictionPowerCutsRestoreOldCandidateAndVictim(); testStaleDuplicateBackupMustClearBeforeManifest(); testMalformedEvictionManifestFailsClosed(); testPostCommitCleanupResidueKeepsWholeNewGeneration(); testDeterministicStress(); std::cout<<"map tile store: "<<tests_run<<" tests passed\n"; }
diff --git a/tests/native/test_map_tile_store.py b/tests/native/test_map_tile_store.py
index 9c726a4d..780df795 100644
--- a/tests/native/test_map_tile_store.py
+++ b/tests/native/test_map_tile_store.py
@@ -29,4 +29,4 @@ def test_bounded_map_tile_store(tmp_path: Path, sanitize: bool) -> None:
         env["UBSAN_OPTIONS"] = "halt_on_error=1:print_stacktrace=1"
     ran = subprocess.run([str(binary)], capture_output=True, text=True, timeout=60, env=env)
     assert ran.returncode == 0, ran.stdout + ran.stderr
-    assert ran.stdout == "map tile store: 22 tests passed\n"
+    assert ran.stdout == "map tile store: 23 tests passed\n"