Hi I made an gif that shows it:
https://photos.google.com/share/AF1Q...JQaFEyOTFLSVJR
( the buttons that I pressed in the toolbar was to change the piano roll timebase view option to: Beat(project) Sync with project and Time ( project)
Explaining: In a project with multiple MIDI Itens with ( Ignore project tempo use X) and with different values . We have this bug when trying to see the midi on the piano roll and zooming out and in the notes placements go nuts.