ID 406768 - A mesh nodes thumbnail image disappears when channels are dragged into the schematic viewport.

Problem summary
A mesh nodes thumbnail image disappears when channels are dragged into the schematic viewport.

If a channel is added by right-clicking the node instead this issue doesn't occur and dragging the channels will then work correctly.

Customer reported version

Modo 13.1v1

Customer reported platform

MacOS 10.14

Steps to reproduce

1) Create a simple cube and go to the Setup layout.

2) In the Schematic Options make sure that Display Mesh/Material Previews is enabled.

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3) Drag the cube item into the schematic viewport, notice how it displays the cube as an image thumbnail.

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4) Drag the Position X channel in from the cubes Properties tab, notice how the image disappears as the channel is added.

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Expected behaviour
The channels should be added below the image thumbnail.

Actual behaviour
The image disappears as the channel is added.

Workaround
When initially adding a channel do it through right-clicking the node and selecting Add Channel. Dragging the channels will then work correctly after the first one is added.

Reproduced by support

This bug has been reproduced in:
13.1v1 - Windows 10 - MacOS 10.13 - Centos 7

13.0v1 - Windows 10

12.2v2 - Windows 10

12.1v2 - Windows 10

12.0v1 - Windows 10

11.2v3 - Windows 10

11.1v1 - Windows 10

11.0v3 - Windows 10

10.2v4 - Windows 10 - MacOS 10.13 - Centos 7

Earliest version tested

10.2v4 - This issue appears to be in all versions of the product.