ID 457836 - Mari crashes after copy/pasting nodes from one object to another and then saving with a specific script.

Problem summary
Mari crashes after copy/pasting nodes from one object to another and then saving with a specific script.

Customer reported version
mari.4.6v4

Customer reported platform

Steps to reproduce

1) Launch Mari with Extension Pack 5 available.

2) Load the specific attached project.

3) Open the Object panel and view the small object layer in the Node Graph.

4) Copy at least 3 backdrops and all their nodes.

5) Select the Large object layer and paste the nodes in the Node Graph.

6) Save the script and observe performance.

7) Repeat steps 3-6 with only copying one mergeChannel4 node instead.

Expected behavior
The project should save and continue without issue.

Actual behavior
Mari crashes and does not save or allow the user to continue.

Workaround
There is no available workaround at this time.

Reproduced by Support in:
Mari 4.6v4 - Windows 10

Earliest version tested
Mari 4.6v4 - project specific issue.