Valenti56
So I dragged and dropped the parts from T2 into T1, allowing the data to be merged.
That shouldn't have been possible in X3. You can no long have clips layered in the same lane. Even if you have drag and drop mode set to Blend, SONAR will eliminate any clip overlap by slip-editing the existing clip out of the way of the one you drop. If the clip you drop is the same size or longer, the existing clip may get slip-edited into oblivion, only recoverable by undo (I've reported this as highly unintuitive and undesirable behavior).
So until you account for that, the rest of the scenario doesn't make much sense.
Or maybe I'm misunderstanding, and the clips were not in the same time range...?