ID 222076 - impossible to Add Correspondence Points at some places on the shape

Problem summary
impossible to Add Correspondence Points at some places on the shape

Customer reported version
nuke.10.0v3

Customer reported platform
windows7

Steps to reproduce

1) open attached script SWACP_AddFail_11372.nk

2) double-click the SplineWarp node and in the Viewer zoom in on the 2 joined curve shapes - inner and outer shapes with existing correspondence points shown; you will see 4 existing correspondence points at 2,4,8, and 10 o'clock joining the 2 round shapes.

3) In the Viewer click to enable the Add Correspondence Points tool and the points joining the the shapes will be shown

4) click on inner shape at 3,6,9, and 12 o'clock and see at 3,6,9 the correspondence points added joining the shapes - but at 12 o'clock the add fails

Reproduced by support

Nuke7.0v9

Nuke10.0v3

OS 10.10.5

Expected behaviour
Correspondence points added at at each point clicked

Actual behaviour
not all points on the shape will accept a new correspondence point