ID 485858 - When using Edge Chamfer on corners, mitering creates two vertices where the edges of the corner meet

Problem summary
When using Edge Chamfer on corners, mitering creates two vertices where the edges of the corner meet

Customer reported version
modo.15.1v1

Customer reported platform
windows10

Steps to reproduce

1) Open Modo

2) Create a Sphere

3) Select and L shape of edges, like below:

4) Edge>Edge Chamfer and just increase the ​Mitering Offset:

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5) Press Tab, you'll see that two vertices now exist in the corner rather than one

Expected behaviour
For only one vertice to be in the corner:

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Actual behaviour
A duplicate vert is created when mitering

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Workaround
Use Bevel rather than Edge Chamfer

Reproduced by support
This bug has been reproduced in:
Modo 15.1v1 - Windows 10, CentOS 7.5
Modo 14.2v1 - Windows 10, CentOS 7.5

Earliest version tested
Modo 14.2v1 - This feature did not exist before this version