This isse has been reported given the feedback from jenrique@redhat.com.

It is not possible to import any process when running the BPMN editor webapp in SDM (dev mode). An error occurs and some expection appears on the console:

On the other hand, this issue ONLY occurs in SDM, not when building the application package from command line.

So although end users will not be affected, this issue is causing lots of inconveniences during development.