Well, no doubt you’ll agree, totally bug free code doesn’t exist 
Also, the “quality” of your internet connection plays a significant part in this as well. Albeit, the chatter between the Streaming services and Bartok are completely stateless, so, problems occurring should be rare.
And by the way, it’s not without precedent for Tidal to do stuff that adversely affects the DAC playback. For example; MPEG and not MQA - #41 by PAR
The reason behind this is that Tidal have unilaterally changed how they are identifying Tidal Master files. So the cause does not lie with Mosaic but that the change by Tidal has resulted in this outcome.
Ultimately, there could be a whole host of reasons for your double-speed playback incident, maybe best to just report it separately if you encounter it again. 