Stunner designer ignores 'jbpm.enable.multi.con=true'

The Stunner designer does not allow multi connections going in/out activity nodes.

It is not possible to create a process like the one in the attachment. Screen Shot 2020-01-27 at 5.12.55 PM.png. Note the screenshot is taken from the Old designer.

Steps to reproduce

1. Start the Business Central server with -Djbpm.enable.multi.con=true
2. Create any activity (e.g. User task).
3. Append any node except Text Annotation to this task (using quick toolbox menu).
4. Try to append one more node to this task (not Text Annotation).

Actual result

It is not possible to do that.

Expected result

It is possible to do that.

Acceptance criteria

It is possible to create more than one outgoing or incoming sequence flows from any activity, event (except the end events) and gateways.