For example, if a node that contains an Action with a non-empty configInfoElements collection is added to the diagram, the configInfoElements collection is not assigned in the ActionDomAdapter.
I added the following line to the end of the "if (action != null)" clause in ActionDomAdapter.initialize():
.. and then things seems to work. I believe this is similar to for example how the events collection is currently initialized in DecisionDomAdapter.initialize(), while of course there may be side effects that I'm not aware of.
It would be great if a fix (possibly the one described above) can be included in GD 3.1.