When selecting notes on the SFX screen, if they extend above the top level, an unusual note will be pasted.

This is the clipboard content at that time.

--[[pod_type="notes"]]unpod("b64:bHo0AD8AAABJAAAA9Qt7bm90ZXM9cHh1AEMgBQkEAC--AA8oDA8gEAYAgQgQDgwIEA8wDwAEBgDwAggQDQwIECx4MD0wLHgxPTh9")

Also, when copying all notes in a track and pasting them to another track with no selection, the track will be formatted incorrectly and will not play.
There is no way to recover except to do an undo.