The specific problem described in this thread is fixed in the recent Dorico 3.5.12 update.
@pianojoe, perhaps you can say a little more about the nature of the problems you’ve been experiencing, preferably including an example project, and we should be able to help. If it’s not specifically related to the combination of condensing and multi-bar rests, then it would probably be best to start a new thread for your problem. I look forward to seeing it and (hopefully) to being able to help you.