A+ Remote, Play queue not progressing

Version 1.6.3 running on iPad mini iOS 10.3.3
When playing a list of songs, the progress and cover image stops after the song completes, even though next song is playing. When using keys for next song it behaves correctly. Happens when streaming from Tidal, not the local library.
A+ runs on my Mac, connected via UPnP to a Raspberry Pi 3 running Moode Audio 3.1 + DAC. The mode GUI shows the correct info.

Seems to be fixed with Audirvana Plus 3.1.2