The resolution has been to change the course assessment to force a path that ensures the scores are properly recorded. We've disabled the exit option, added a warning on the fail/success layers that they must click a button (to progress to next slide) to correctly record scores. "Exit" slide has actions to forcefully record the completion/passed status and close.
The reason for the missing raw score logs is that the SCORM only periodically reports the interactions back to the LMS (every 30 seconds or so). If multiple questions have been answered between report backs, only the last score is logged. However, the full set of SCORM interactions is passed back and recorded. The missing raw score logs is confusing but a non-issue.
We're assuming this reporting delay introduces a window of opportunity for the learner to close the browser before the final scores and completion status have been reported back to the LMS. Adding a positive action final slide to exit the course, that ensures the status is reported back, seems to do the trick.
Learner may ignore correct path and simply close the browser window before final scores/status is reported back, but then that's on them!
