That is about as clean as I could get it. I could show photos having more data points, but that’s beside the point.
Sorry I can’t help, but I concluded my problem originates from my controller, a Studio Logic VMK 188 plus. For proof, I can take any pedal and connect it to any of my synthesizers and record the midi on/off in Cubase and it behaves as a switch sustain pedal should behave. But if I plug any of my pedals into the Studio Logic, then record in Cubase I get the problems shown above.
As Steve said check it in MidiOX, and have you checked it with another controller to eliminate the chance the problem isn’t the controller? How long has this been going on?