Podcasts do not work with the current build of librespot with Raspotify. Build the latest release and replace the binary.
apt-get install cargo build-essential libasound2-dev cargo install librespot --branch dev --force --features alsa-backend systemctl stop raspotify cp /usr/bin/librespot /usr/bin/librespot.bak chmod +x /root/.cargo/bin/librespot ln /root/.cargo/bin/librespot /usr/bin/librespot systemctl start raspotify