ID 281138 - Adjustment nodes with two or more inputs do not copy/paste as expected.

Problem summary
Adjustment nodes with two or more inputs do not copy/paste as expected. Copy and pasting this custom node duplicated unwanted nodes attached to it.

Customer reported version
3.3v1

Customer reported platform
Windows7

Steps to reproduce

1) Create a custom node with 2 inputs

2) Select it and copy/paste the node in the node graph

3) Additional nodes will also be duplicated unintentionally
Reproduced by support
Reproduced by engineer
Mari 3.3v1
Mac OSX

Expected behaviour
Mari should only copy/paste the selected node.

Actual behaviour
Every downstream node is also duplicated.