Well - made some investigations with editor mode. Although I couldn't trigger your exact fault, I saw certain problems after leaving editor mode and returning to normal game mode.
The main origin for all is, that in editor mode none of the expected (and needed) events is risen when building/destroying some of the DART components and thus breaking the existing logic. To fix that it would be necessary to scan all existing platforms for changes of the DART infrastructure and to merge that with the already known parts.
As I am already on the way to implement other - IMO more needed features - I would handle this as a feature request and postpone until later. I opened a corresponding issue in github.