Writing right hand fingerings (pima) in banjo tablature causes intermittent playback. Every second note drops out. Could also be a problem with left hand fingerings, and tablature for other instruments (guitars, ukulele, mandolin, etc.).
Save the score to dropbox and opened in Notion 6.8 on Mac OS High Sierra 10.13.6. Used a VSTi for the banjo. Problem went away.
The existing problem on iOS is repeatable. Removing the r.h. fingerings restores normal playback. Replacing them repeats the error. Please test and report back. Thanks.