Based on many examples in this forum, I created drag and drop questions with more than one right drop target for the drag items.
I used True/False questions as a base and set up trigger to change the state of the checkboxes based on the state of the drag items (Drop Correct vs. Drop Incorrect).
This worked as expected while building the questions in the single slide preview, but when I preview the entire scene (or visit the question in published form) and the questions are not viewed by themselves but on a draw from question bank slide, the checkboxes are not responding to the drops.
Maybe someone has an idea what is happening here?
Update: wrote a bug report.