Azure Redis Cache Prefixed with 2_

Hi,
From APIM I am unable to access my key-value pairs in Azure Redis Cache, as all the keys are prefixed with _2 when they try to access Redis Cache. Is this bug ?

I also saw another thread that was marked as closed, how I would like understand why is it this way and is there any trust worthy documentation to account for it.

https://github.com/Azure/api-management-policy-snippets/issues/43

Review the APIM-to-Azure Redis Cache behavior described in this issue and compare it with the linked issue 43. No repository file or test is identified, so first determine whether the _2 key prefix is expected; done would require an authoritative explanation or documentation reference.

Written by the indexing model from the issue text.