ID 443058 - Nuke freezes when using Keylight.

Problem summary
Nuke freezes when using Keylight.

Customer reported version
n/a

Customer reported platform

Steps to reproduce

1) In Nuke, load the attached script.

2) Open the Keylight properties panel.

3) Drag around the slider knobs (e.g. Screen Gain / Screen Balance)

4) Observe performance in Nuke.

Expected behavior
The slider knobs should continue to display results in the Viewer.

Actual behavior
Nuke freezes/hangs and becomes inoperable.

Workaround
There is no available workaround at this time.

Reproduced by Developers in:
Nuke 12.2v1 - macOS 10.14.6

Unable to reproduce bug in:
Nuke 12.1v4 - macOS 10.14.6

Earliest version tested
Nuke 12.1v4 - This issue doesn't appear in this version and has regressed