"TypeError: Super expression must either be null or a function" only in production build

When I create a production build, I get the issue "TypeError: Super expression must either be null or a function" and the whole application breaks. As it only happens in production builds its hard to debug.

Here some screenshots from the issue stack:



Here the important versions I am using:
"react": "16.13.1",
"react-dom": "16.13.1",
"react-sortable-tree": "^2.8.0",
"webpack": "4.35.3"

Thanks for your help, I am trying to figure out the source of the issue since days but cant find it.
I think its source is within react-dnd in combination with webpack...

Thanks
Pascal