Yes, sorry, meant to do this earlier but was busy and forgot.
So, in the first image, see how I've got a clip, split in the middle of some silence:
Now see how I've dragged the edge of the right hand clip to overlap with the left. This area is still silent, but it draws in a waveform. The area is still silent on playback:
In the last image, I've dragged the edge out further. Notice how the phantom waveform is now wider as if stretched. This area is still silent.