I don't know if it's a bug or if it's not clear to me how it works (on beta #312).
If I move or rename a linked image, when the document is opened, in the missing links window popup, if I click on "No", the "Resource Manager" window opens, if I click on "Resource Manager" nothing happens, if I click on "Yes ”The finder's search window opens.
It seems to me that the "No" and "Resource Manager" buttons have inverted operation.