Vue props not persisting update

So I'm working on a node editor that allows you to do multiple selection and multiple move.

I have spent hours on this trivial problem with no joy.

Steps to recreate issue

• shift click two nodes
• move one node, (see two nodes move 👌)
• do the move again

You will see the node that was 'parented' by the move just snaps back to it's original props rather than remembering it's position?!

Files of interest

• Boundary.vue (parent)
• Node.vue (v-for children)

https://0g7eu.csb.app/