ID 551853 - Mirroring Patch selection gives an error when used inside a Group node in the Node Graph

Problem summary
Mirroring Patch selection gives an error when used inside a Group node in the Node Graph.
 
Customer reported version
Mari 6.0v2
 
Customer reported platform
Rocky 8
 
Steps to reproduce
1) In Mari, open a project or create the example (Help > Create Example)
2) Add a new Channel with any name.
3) Open the Node Graph panel and find the new channel nodes.
4) Select all but the channel node and press Ctrl+G to Group them.
5) Go into the Group subgraph and select the Paint node.
6) Use the Paint tool to paint on the object.
7) Choose the Select tool and click on a patch of the object.
8) Right-click the patch and navigate and select Patches>Mirror> select any option.
 

 
Expected behaviour
The mirror action should be applied to the Patch.
 
Actual behaviour
An error is given for "No paintable layers or paint nodes selected. Would you like to mirror all paintable layers?" Choosing any of the mirroring options has no effect.
Note: Mari4.0v4 was giving errors of "The current channel contains no paintable layers."
 
Workaround
Selecting the Group node prior to going into the group and selecting Paint allows the Mirror action to complete.
 
Reproduced by Support in:
Mari 6.0v2 - Windows 10, CentOS 7
Mari 6.0v1 - Windows 10
Mari 5.0v1 - Windows 10
Mari 4.7v1 - Windows 10
Mari 4.1v1 - Windows 10, CentOS 7
 
Unable to reproduce bug in:
Mari 4.0v4 - Windows 10, CentOS 7
 
Earliest version tested
Mari 4.0v4 - This issue appears to be in all tested versions of the product