Why does my initial real open always fail with error [Core] Reading failed: End of input but subsequent opens work?

MongoDB Atlas App Services & Realm Atlas Device Sync
1

The first time I open my app on a new device (and every subsequent open) I login, build and open my realm collections. Here is the code for one collection, I do open multiple connections but do it asynchronously

        val user = login()
        // create a SyncConfiguration
       val logedintime = System.currentTimeMillis() - startTime
        println("Log in time taken: $logedintime ms")
        // Items
        val config = SyncConfiguration.Builder(user, setOf(item::class))
          .waitForInitialRemoteData(600.seconds)
          .initialSubscriptions { realm ->
            add(
              realm.query<item>(),
              "items"
            )
          }
          .build()
        val buildtime = System.currentTimeMillis() - startTime
        println("build realm time taken: $buildtime ms")
        itemRealm = Realm.open(config)
        val opentime = System.currentTimeMillis() - startTime
        println("open realm time taken: $opentime ms")

        Log.v("realmPlugin","Successfully opened realm: ${itemRealm.configuration}")

Every first time this process runs it never succesfully opens the connections. I get the following error: REALM W [Core] Reading failed: End of input

However If I shut my app and run it again it will always work on subsequent opens.

Any ideas of what could cause this or how I can fix this issue?