Steps to reproduce:

• Create three pages: testpageA, testpage1, testpage2.
• Add the dynamic tasklist macro to testpage1, and add a task containing a link to [testpageA] (it is a proper link; if you click on it you go to testpageA.)
• Also add a link to testpageA on testpage2 (control).
• Rename testpageA to testpageB.
  Result: The link on testpage2 now links to testpageB as expected, but the link on testpage1 still links to a now non-existing testpageA.

Additional info:
If, before renaming testpageA, you select "tools"->"info", you will see that confluence has only registered the incoming link from testpage2 – not the link in the tasklist on testpage1. So, it seems that the Confluence linking system does even register links within the dynamic tasklist macro (I don't know is this is also true for other macros – but it should definitely be corrected. Broken links are such a nuisance.)

Why is this important:
We use Confluence to handle projects, and we usually create a central project-page which includes links to the work-items in this project. It would be ideal to use the dynamic tasklist for listing the project's work-items, as this gives a clear visual overview of the project's progress. However, if links within the tasklist gets broken on page rename, we have to abandon the otherwise appealing tasklist and just use a standard bullet-list or similar.