ID 497600 - Viewing a STMap node causes Nuke to crash.

Problem summary
Viewing a STMap node causes Nuke to crash. The issue happens more frequently when making changes to the upstream ST Map, for example, when applying a Grade.

Customer reported version
Nuke 13.1v1

Customer reported platform
Windows 10

Steps to reproduce

1) Open Nuke

2) Create a STMap using the Expression or C_GenerateMap node.

To get a STMap from the C_GenerateMap node, you need to change the Map knob to stmap and its channel knob to rgb.

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3) Create a Grade node, connect the Expression node to the Grade node input

4) Create a Checkerboard node

5) Create a STMap node, connect the Grade node to the stmap input and the CheckerBoard to the src input

6) Change the STMap node's UV channels knob to RGB and thefilter knob to Impulse.

7) Connect the Viewer to the STMap

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8) Open the Grade node properties and adjust the values of the node from within the properties panel until Nuke crashes
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Expected behaviour
Nuke should not crash when viewing the output of the STMap node.

Actual behaviour
Viewing an STMap node causes Nuke to crash. The issue happens more frequently when making changes to the upstream ST Map, for example, when applying a Grade.

Workaround
The issue does not occur with the C_STMap node and can be used in place of the STMap node, as the C_STMap node is part of CaraVR, a NukeX license will be required to use the node.

Reproduced by support
This bug has been reproduced in:
Nuke 13.1v1 - Windows 10 - MacOS 10.15.3 - CentOS 7

Unable to reproduce bug in:
Nuke 13.0v5 - Windows 10 - MacOS 10.15.3 - CentOS 7 - Regression

Earliest version tested
Nuke 13.0v5 - This issue doesn't appear in this version and has regressed