On Windows. Dragging an end paired tag, say </Xpt1> out of valid sequence, say before <Xpt1> creates a new <Xpt5766> tag. Maybe the intention is to handle this as an OnExitSegment() error handler?
Can you confirm that this still happens on the latest commit of the tagAwareCnP branch (7024a2fc1c473a157c640f6277480f07ee9a4172)? This sounds like something I mentioned by email was a known issue that I then fixed later.
Will do but in transit for the next few hours.