diff --git a/src/Cache/CacheBase.php b/src/Cache/CacheBase.php
index 696f4cb6e88f0c3e3c2ef69c61dd63dc05225df2..e3f3e5fb817ee39307c9c25f49734460b14a4235 100644
--- a/src/Cache/CacheBase.php
+++ b/src/Cache/CacheBase.php
@@ -127,6 +127,16 @@ abstract class CacheBase implements CacheBackendInterface {
     $this->setPermTtl();
   }
 
+  /**
+   * Returns the CID for the last write timestamp cache.
+   *
+   * @return string
+   *   The last write timestamp CID.
+   */
+  public function getLastWriteCid(): string {
+    return ChainedFastBackend::LAST_WRITE_TIMESTAMP_PREFIX . 'cache_' . $this->bin;
+  }
+
   /**
    * Checks whether the cache id is the last write timestamp.
    *
@@ -142,7 +152,7 @@ abstract class CacheBase implements CacheBackendInterface {
    * @return bool
    */
   protected function isLastWriteTimestamp(string $cid): bool {
-    return $cid === ChainedFastBackend::LAST_WRITE_TIMESTAMP_PREFIX . 'cache_' . $this->bin;
+    return $cid === $this->getLastWriteCid();
   }
 
   /**
@@ -488,6 +498,9 @@ abstract class CacheBase implements CacheBackendInterface {
     usleep(1000);
     $this->lastDeleteAll = round(microtime(TRUE), 3);
     $this->client->set($this->getKey(static::LAST_DELETE_ALL_KEY), $this->lastDeleteAll);
+
+    // Also delete the last write timestamp in case the bin is accessed directly.
+    $this->client->del($this->getPrefix() . ':' . $this->getLastWriteCid());
   }
 
 }
diff --git a/tests/src/Kernel/ChainedFastWithRedisCacheTest.php b/tests/src/Kernel/ChainedFastWithRedisCacheTest.php
index 8187323839d2142f99007bd17caae4dc62d27a46..06d05dfcbc5426053a1c7936cd39158d655da384 100644
--- a/tests/src/Kernel/ChainedFastWithRedisCacheTest.php
+++ b/tests/src/Kernel/ChainedFastWithRedisCacheTest.php
@@ -30,4 +30,24 @@ class ChainedFastWithRedisCacheTest extends RedisCacheTest {
     return $backend;
   }
 
+  /**
+   * Tests calling deleteAll() on the consistent backend directly.
+   */
+  public function testDeleteAllBypass() {
+    $backend = $this->getCacheBackend('example');
+
+    $cid = 'example_item';
+    $backend->set($cid, 'foo');
+
+    // Explicitly create a new backend.
+    $backend = $this->createCacheBackend('example');
+    $this->assertSame('foo', $backend->get($cid)->data);
+
+    $consistent_backend = \Drupal::service('cache.backend.redis')->get('example');
+    $consistent_backend->deleteAll();
+
+    $backend = $this->createCacheBackend('example');
+    $this->assertFalse($backend->get($cid));
+  }
+
 }