ID 522414 - Copy/Paste a material is converts it to a Group is there is a node named Bump in the Node Graph

Problem summary
Copy/Paste a material is converts it to a Group is there is a node named Bump in the Node Graph

Customer reported version
mari.6.0v1

Customer reported platform
windows10

Steps to reproduce

1) Open any project

2) Create a Material node, using any shader

3) Create a Color node and name it Bump

4) Copy and Paste the Material node, it will change to a Group node

Expected behaviour
For the pasted material to still be a material:

Actual behaviour
The Material node is converted to a group when being pasted:

Workaround
Rename any nodes called Bump to something else

Reproduced by support
This bug has been reproduced in:
Mari 6.0v1 - Windows 10

Also reproduced by QA