When bug A (proposed/accepted blocker) is closed as a duplicate of bug B (not proposed as a blocker), it disappears from the list. Unfortunately a lot of developers won't transfer the Blocks: and Whiteboard: fields, so we might lose track of some important bugs this way.

Displaying A or B in the list even when this happens would be nice. Displaying B is probably the preferable way. There could be a special icon indicating that B is displayed because of recursive dependencies and tooltip would specify it is because of bug A.