Cut and Paste support is specifically designed to work from one project to another in BulkEdit, as it does not interact with the users clipboard. So I do not expect that to work as it is not something I have specifically tested.
However it is a great feature suggestion that I will definitely add the list of things to add in a future update.
As for the error, that sounds like an intermittent failure due to something like connectivity, for example it may have timed out. Bulk Edit is designed to retry and resume if possible so as you were able to update projects otherwise I’m going to assume that is the case.
Hope that helps,