I've been using Pocket Casts and Google Navigation together for a while. There is a setting in pocket casts to play over notifications and navigation prompts.

I've been using Pocket Casts and Google Navigation together for a while. There is a setting in pocket casts to play over notifications and navigation prompts. I had to switch to this a few months ago because navigation prompts started getting muted for about 1 second, then they became audible half-way through and then the transition back to the podcast worked fine.