John, this is a good piece of detective work. I can confirm your findings. It happens for me only if I generate, after having viewed in Staff Roll Notation Mode.
I suspect you have found an 'undesirable / unintended' operation.
Here are my findings:
BIAB & RB2026 Win.(Audiophile), Windows 10 Pro & Windows 11, Cakewalk Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Session Keys Grand S & Electric R, Kontakt, Focusrite 18i20, KetronSD2, NS40M, Pioneer Active Monitors.
BIAB & RB2026 Win.(Audiophile), Windows 10 Pro & Windows 11, Cakewalk Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Session Keys Grand S & Electric R, Kontakt, Focusrite 18i20, KetronSD2, NS40M, Pioneer Active Monitors.
Go thru the thing step by step again, but first unchecking "Clean Notation" and see what you get then.
It could also just be a corrupted songfile in which someone did an Edit in such fashion that they got what they wanted in the way of how it sounds but did not pay attention to the Notation. Many don't, many can't. Editing an existing note by way of Durations can sometimes leave the Notation in a previous state. In some instances, I've found that Deleting offending note(s) and re-entering them properly and resaving can correct such things.
BIAB & RB2026 Win.(Audiophile), Windows 10 Pro & Windows 11, Cakewalk Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Session Keys Grand S & Electric R, Kontakt, Focusrite 18i20, KetronSD2, NS40M, Pioneer Active Monitors.
OK, I'm back. That Clean check-box is a contributor. Nice call.
However, generating a song shouldn't change the Notation display IMO.
I would have thought maybe checking/unchecking 'Clean' might change the display, but after generating, checking/un-checking Clean makes no difference to the display. The Generate without Clean is what changes the Notation in this case. Strange?
What are your thoughts?
BIAB & RB2026 Win.(Audiophile), Windows 10 Pro & Windows 11, Cakewalk Bandlab, Izotope Prod.Bundle, Roland RD-1000, Synthogy Ivory, Session Keys Grand S & Electric R, Kontakt, Focusrite 18i20, KetronSD2, NS40M, Pioneer Active Monitors.
This is niot a bug in BB, this is a bad songfile. BB is only doing what was entered and saved in a wrong fashion.
Improperly entered songfile.
Free internet downloads are notorious for such things in them.
It is also possible to do it to yourself by the way in which Edits are improperly made. In Notation Edit View, for example, one can RightClick on a note, select Edit Note and uswe the Spinner to change Duration value (or they could open the PianoRoll view and drag the Duration value, same thing under the hood) and thus increase of decrease a note duration such that it now "sounds right" but what you see is exactly what can happen, until regenerated, the original notation as saved will be there first.
Again:
If you Delete those offending notes and Re-enter them properly, then Save the songfile, it should fix the problem.
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