Midi note-off messages not sent during editing
Steps to reproduce the behavior:
1) Play notes when editing should be set to "ON"
2) Midi output should be sending midi to any external synth engine of your choice (software or hardware will both have the same result)
3) Add notes to a staff
When adding notes to the staff or editing existing notes, the notes will send note-on messages but do note send any note-off messages, resulting in any connected synth holding the notes forever as a note cluster
A midi note-off message should be sent after a period of time as specified in the setting "Default duration" (which is typically set to 300ms)
Please see an earlier post from someone else about this same issue: