ID 410012 - The wrong tab is initialized when creating a node with the setTab() function via Python.

Problem summary
The wrong tab is initialized when creating a node with the setTab() function via Python. 

Customer reported version
nuke.11.2v5

Customer reported platform
windows7

Steps to reproduce

1) In Nuke, open the Script Editor.

2) Run the following snippet:

blur = nuke.createNode("Blur")
knob = nuke.PyScript_Knob("test")
blur.addKnob(knob)
blur.setTab(0)

Expected behavior
The first tab should be shown when creating the node.

Actual behavior
The User created tab is displayed when creating the node.

Workaround
Adding a QTimer to the script allows the correct tab to be shown when created via Python.

from PySide2.QtCore import QTimer

blur = nuke.createNode("Blur")
knob = nuke.PyScript_Knob("test")
blur.addKnob(knob)
QTimer.singleShot(100, lambda: blur.setTab(0)) 

Reproduced by Support in:

Nuke 12.0v1 - Windows 10, CentOS 7, macOS 10.13

Nuke 11.3v5 - Windows 10

Nuke 11.3v1 - Windows 10

Nuke 11.2v6 - Windows 10

Nuke 11.2v1 - Windows 10

Unable to reproduce bug in:

Nuke 11.1v6 - Windows 10, CentOS 7, macOS 10.13

Earliest version tested
Nuke11.1v6 - This issue doesn't appear in this version and has regressed