I can replicate this issue. This is definitely a bug. I never have dropouts.
@eric, my Roon Server core is on a Mac Mini and controlled via iPad Air 2.
As with @scirica, I selected a Tidal track 16/44 and pressed Play. I then added a 24/88 track to the queue. I then added another Tidal 16/44 track to the queue.
As soon as the first Tidal track finishes, the 24/88 track tries to start and then completely skips to the next Tidal track.
I can replicate with various track formats.
Cheers, Greg