Convert entities introduces a dimension that cannot be seen except in equations

This is something I've been aware of for a while, but it just nearly caught me out

Example

Sketch1 Just a simple Rectangle

Sketch2 Select Sketch1 > Convert Entities

All good, but if you look in equations...

The convert entities feature has added a dimension, that appears to be an offset

The thing is this dimension doesn't appear in Sketch2 at all, and the Sketch relation symbol is 'On Edge' Not Offset

So if say by accident you edit the dimension in equations then sketch2 is now offset, but there is no way of telling if you examine just the sketch

Contrast this to what an intentional offset would look like

I understand this problem is unlikely, but never the less it's a potential pitfall.

The best work-a-round I have found is this

I would much prefer if this was not the behaviour, surely it is unintended?

I'm currently using 2016, but it was the same in 2015.