@Martin.Jirsak When you use render in place the Rendered Event is supposed to be perfectly aligned with the Original Event, the Buffer plays no role in that, and if ever it was, why would the Rendered Event be placed earlier in time ? If ever the Buffer were doing something it would then place it later and not earlier…
My guess here is that this is a bug with the Snap Point where the rendered event have some sort of offset in it, and it results in shifting the Event to the left. This have already been discussed in the past on another topic :
On this topic it talks about recording, but that also occurs when rendering. Also the topic is from Cubase 10.5 and when I tested it I was Cubase 12. So far this is highly unreliable to reproduce, but it’s there.