There is a big fat stupid bug in Bus envelope pasting. Maybe it's my fault for having a bus with three automated sends to other busses.
I can create the target sends ahead of time, or not. The pasted envelope nodes are either from a different envelope than the one I thought I was copying; or they go in as "phantom" nodes in an envelope that is not select-able, and not re-assignable.
This sucks.
I will attempt to work up a project from scratch tomorrow that duplicates the problem, because although it has to be related to
CWBRN-27091 I don't think that tracking number from 2014 is going to be helpful.