See this video (http://screencast.com/t/8LVmHurACJ) for an example, but when you choose to merge two items it seems that the items aren't all listed. This is a new bug and wasn't an issue in the past.
Okay, a further test shows that the items do come over to the one record even without the 952 - but it's confusing because what if I don't want all the items to merge?
Reclassifying this report as an enhancement request, since the items to indeed come over, and can be deleted after the merge (if the librarian chooses). Adding a mechanism for not carrying over certain items would be a nice feature to add, but since it only saves steps, I don't think it should be listed as a bug.
I am changing the bug report's title to make it less scary :) I just tested on master and items moved over nicely.