Deleting Podcasts Documents and Data

My Podcast App v 2.2.1 on iPhone 6, iOS 8.4 is retaining 1.3GB worth of data that I cannot delete.

When you go to Settings/Usage/Manage Storage/Podcasts: it reads Documents & Data 1.3GB. I have deleted all podcasts subscriptions and all podcasts from the phone but there is no way to delete the "documents and data".

There is another thread on Apple support with no solution:

How do I delete "Documents and Data" in podcast on my Iphone 5? I know how to delete individual podcast and podcast epi…

I have backed up and synced multiple times after deleting all the Podcasts from the phone. Rebooting the phone - no luck. You are unable to delete the Podcast app itself so there is no way to un-install and re-install it - apart from doing a complete "re-store from backup" - which as listed in the thread above, doesn't work.

Does anyone have a fix for this???