I found this last week, but I did not put it into effect. It does sound logical:
If playlists are important to you, there’s an easy solution: Delete the Podcasts app. (Tap and hold the app’s icon until it jiggles, then tap the X in the top-left corner.) Continue downloading podcasts to iTunes, adding them to the playlists you want and syncing to your iPhone or iPad. Tap the Music app, tap Other, and you’ll see Podcasts listed. Tap Playlists, and your podcasts’ playlists will be there as they used to be. You won’t get the syncing of subscriptions and played episodes, but you will have more control over the podcasts you can access.
https://support.apple.com/en-us/HT204207