Copy var-instance does not work

Hi there,
I copy/paste a sequence into a new blank project.
In the variable list, I create a new Regex pattern like: “new Regex(”\n(\d\d) “)” - what will also be copied/pasted.
UI-Studio throws an error, until I delete and re-create this variable again…without any changes - no error.

I know, copy/pasting a large sequence is not a nice way …but anyway…

Is it a bug?

thanks, sidame00