Steps to reproduce:
  1. Create object A with some content in it across multiple (at least n) blocks
  2. Use "copy block reference" to refer to n different blocks in object A and paste these into object B, creating n transclusions in object B of different blocks in object A
  3. Cmd-click one of the transcluded blocks from within object B
  4. n new tabs are created of object A, when we only expected one to open
The number of tabs opened always corresponds exactly to the total number of references to blocks of object A in object B.