ID 407519 - Nuke crashes when Cloning in a Rotopaint node with stereo and multiple Viewers open

Problem summary
Nuke crashes when Cloning in a Rotopaint node with stereo and multiple Viewers open

This is an intermittent issue, and only seems to affect Windows

Customer reported version
Unknown. If known please add product version used by the customer

Customer reported platform
Unknown. If known please add OS and OS version used by the customer

Steps to reproduce

1) Open the linked Nuke script and setup the workspace like below:

3) Start painting Viewer1, occasionally changing frame, switching View and moving the Clone target, Nuke will eventually crash

*This crash is itterminetent. so it can take a while to reproduce

Expected behaviour
For Nuke to continue painting

Actual behaviour
Nuke Crashed

Reproduced by support

This bug has been reproduced in:
Nuke 11.3v5 - Windows 10

Nuke 11.3v1 - Windows 10

Nuke 11.0v1 - Windows 10

Unable to reproduce bug in:
Nuke 11.3v5 - CentOS 6 - OSX 10.13

Earliest version tested
Nuke 11.0v1