ID 583638 - The Roto node has a BeginGroup/EndGroup knob with no name

Problem summary
The Roto node has a BeginGroup/EndGroup knob with no name. This means that, unlike other knobs of the same type, it cannot be accessed via Python.
 
Customer reported version
Nuke 15.0v4
 
Customer reported platform
Windows 11
 
Steps to reproduce
 
1) Open Nuke.
 
2) Create a Roto node.
 
3) Hover over the black arrow/triangle and notice that it doesn't have a name.
 

 
Expected behaviour
You can access the extra matrix knob on the Transform tab:
 

 
For example, to set its default value:

nuke.knobDefault("Roto.extra matrix", "True")

 
So the behaviour should be consistent with knobs of this type.
 
Actual behaviour
The knob has no name, so cannot be accessed via Python.
 
Workaround
Unknown. 
 
Reproduced by support
This bug has been reproduced in:
Nuke 15.1v2 - Windows 11 - Linux Rocky 9
Nuke 12.0v1 - Windows 11 - Linux CentOS 7
 
Earliest version tested
Nuke 12.0v1
- This issue appears to be in all tested versions of the product