So when using the Overcast app I can go to “All Episodes” to see all my unplayed episodes, select one, then start driving. When that episode finishes it will then start playing, by date, the oldest episode next and keep going until all caught up. This is not just from one podcast, that is from all unplayed products.
Is there no way to do this on Plex? There does not seem to be a way of playing all “On Deck” which would do about the something. It makes it impossible to use while driving.
Podcasts->My Podcasts->Filter (Top Right Corner)->Change Type tp Episodes and Sort by Date->Play and Enjoy 
This does not work.
Set filter to unplayed, by date, episodes. Selected the one I wanted to play first and when it was over did not continue to play any other episode.
You are right. It should work but it just doesn’t. It doesn’t even let me save as a smart playlist 
sigh… another barrier to complete adoption. Hope they see that this is as a must have, as there is much listening in the car, and add it soon.
Just did a 500 mile drive and Plex podcasts were useless because it does not continually play. Switched back to Overcast for now.