ID 430862 - The brown border disappears when selecting objects with the ModelBuilder Carve tool

Problem summary
The brown border disappears when selecting objects with the ModelBuilder Carve tool.

Customer reported version
nuke.12.0v3

Customer reported platform
windows10

Steps to reproduce

1) In Nuke, create a ModelBuilder node.

2) Select the Shape tab and create any shape.

3) In the Viewer, right-click and select the Carve tool.

4) Observe the brown border of the Viewer.

5) Click on any object to select it and view the border of the Viewer.

Expected behavior
The brown border should remain on the Viewer when carving an object.

Actual behavior
The brown border of the carve tool disappears from the Viewer.

Workaround
There is no available workaround at this time.

Reproduced by Support in

Nuke 12.1v1 - Windows 10

Nuke 12.0v1 - Windows 10

Nuke 11.0v1 - Windows 10

Nuke 10.0v1 - Windows 10

Nuke 9.0v1 - Windows 10

Nuke 8.0v1 - Windows 10

Earliest version tested
Nuke 8.0v1 - This issue appears to be in all versions of the product