CacheManager Redis Backplane not flushing clients

Question

I've recently migrated my code away from a just using a distributed cache to using the CacheManager for 2 layers of caching to increase speed across my applications.

I'm using InMemory and Redis as a backplane.

All is working good so far as InMemory and storing the information back to Redis is concerned but I'm struggling with invalidating the cache and seeing new information.

I have a console application which runs on the server which performs updates to data then uses the AddOrUpdate method in CacheManager to push new data to the caches.

The problem is that my front end API is seeing stale data and doesn't update.

I know the console application was working previously as it was all working on the distributed caching and it would update frequently.

I've logged into Redis and I've checked if there are any subscribers to the PUBSUB channel and there aren't; should there be?

Both my console application and the API are using the same version of the library and also using the same cache configuration. Configuration is below.

{
  "$schema": "http://cachemanager.michaco.net/schemas/cachemanager.json#",
  "redis": [
    {
      "key": "redisConnection",
      "connectionString": "x.x.x.x, allowAdmin=true"
    }
  ],
  "cacheManagers": [
    {
      "maxRetries": 1000,
      "name": "masterCache",
      "retryTimeout": 100,
      "updateMode": "Up",
      "backplane": {
        "key": "redisConnection",
        "knownType": "Redis",
        "channelName": "redisChannel"
      },
      "loggerFactory": {
        "knownType": "Microsoft"
      },
      "serializer": {
        "knownType": "Json"
      },
      "handles": [
        {
          "knownType": "SystemRuntime",
          "isBackplaneSource": false,
          "name": "systemCache"
        },
        {
          "knownType": "Redis",
          "key": "redisConnection",
          "isBackplaneSource": true
        }
      ]
    }
  ] 
}

Also the results of checking the number of subscribers in Redis

127.0.0.1:6379> pubsub channels *
1) "redisChannel"
2) "__Booksleeve_MasterChanged"
127.0.0.1:6379> pubsub numsub 1
1) "1"
2) (integer) 0