BUG? - Vector shapes move after when resizing PSDs with layer comps.

Question

I use layer comps to show different interaction steps through my designs.
Designing mostly for mobile, i create at @1x (72 Pixels/Inch) resolution, and then scale up to @2x (144 PPI) and @3x (216 PPI) to get my assets for higher resolution devices.
However when i scale the PSD, all vector shapes within it offset themselves by one pixel up and to the left for @2x resolution and two pixels for @3x resolution, meaning all my careful alignments go out the window. Raster elements and text fields behave as they should and do not shift.
All my vectors shapes are bang on the the pixel to begin with so that's not a factor, and the scaling is a multiple so again that isn't the cause either.
You can see the issue in the image attached.
The obvious white edges along the right and bottom edges are revealed after the scale and layer comp change as the shapes shift.
The bitmap layers equivalent on the right are fine.
You can try it for yourself by downloading this PSD...
http://neonstate.com/scale-layer-comps-test.psd
1. Open the file
2. Change the resolution by going to Image / Image Size and entering 144 or 216 as the resolution.
3. Step through the layer comps, you'll see after the first layer comp is changed that the vector shapes shift, affecting all layer comps.
I'm sure this didn't used to happen, but what it means is I can no longer use this technique.
I'm using Photoshop CC 2014.2.2 / 20141204.r.310 x64
Any help much appreciated.
Rob

Answer 1

Hi again,
The purpose of this checkbox in the Layer Comp settings is to remember the positions of items, if you turn it off then you can save the positions which defeats the point a bit.
I've created another example to better explain - http://neonstate.com/scale-layer-comps-test-reposition.psd
If you step through the layer comps you'll see the shapes move from one position to the next, i've set these positions specifically.
Now change the resolution to 144 or 216.
Everything looks fine until you step through the layer comps - the boxes change position as they should, but the vector ones are incorrectly offset to the top left.
Rob