ID 501991 - UV island incorrectly reattaches after using Ctrl + Shift to UV tear.

Problem summary
UV island incorrectly reattaches after using Ctrl + Shift to UV tear.

Customer reported version
modo.15.2v1

Customer reported platform
windows10

Steps to reproduce

1) Launch Modo.

2) Create a cube.

3) Go to UV layout and unwrap the cube.

4) Select Polygon mode and click on one of the polygons in the UV viewport.

5) Press W to pick up the move tool.

6) In tool properties enable Tear Off.

7) Hold Shift+Control and drag one of the tool handles to tear away the island.

8) Release Shift and Control.

9) Drag one of the move tool handles again.

10) Note that the island reattaches.

Expected behaviour
The island should not be reattached.

Actual behaviour
The island reattaches to the rest of the UV.

Workaround
Unknown. 

Reproduced by support
This bug has been reproduced in:

15.2v2 - Windows 10
15.1v1 - Windows 10
15.0v1 - Windows 10 - Regression

Unable to reproduce bug in:
14.2v2 - Windows 10

Earliest version tested
14.2v2 - This issue doesn't appear in this version and has regressed