ID 494712 - The Swap Input/Output button on SphericalTransform node functions incorrectly

Problem summary
The Swap Input/Output button on SphericalTransform node functions incorrectly.

Customer reported version
13.0::13.0v5

Customer reported platform
centos7

Steps to reproduce
1) In Nuke, place a SphericalTransform node in the Node Graph.
2) Add an input and an output with any nodes.
3) In the Properties bin, select the Swap Input/Output button

Expected behavior
The Input/Output should swap without error.

Actual behavior
An error message appears as: 'dict' object has no attribute 'iteritems'

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Workaround
There is no available workaround at this time.

Reproduced by Support in:
Nuke 13.0v5 - Windows 10, macOS 10.15
Nuke 13.0v4 - Windows 10
Nuke 13.0v3 - Windows 10
Nuke 13.0v2 - Windows 10
Nuke 13.0v1 - Windows 10, macOS 10.15

Unable to reproduce bug in:
Nuke 12.2v9 - Windows 10, macOS 10.15

Earliest version tested
Nuke 12.2v9 - This issue doesn't appear in this version and has regressed