This had me very curious, so I investigated further, using a different DAW. In Maschine I can slow down tempo to 1bpm, which lends itself well to forensic efforts 
This is what I played in…
And this is what was recorded in Scaler’s internal “Midi capture” (copied over to piano roll).
It does appear here that it is quantizing. But I do notice that the sound is often delayed, or sometimes plain not audible at all. I do wonder if there’s some latency with the sound engine, unrelated to the MIDI note timing?