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Not sure if this is a Contextual links issue, or IPE, or Panels or Panelizer...
Anyway to replicate the problem:
1. Klick the IPE edit button on an Panelized page.
2. Click save.
3. The Contextual link on any item will have the "destination" query param set to
The whole url looks like:
What happens is that after you save that content you will end up on panels/ajax/ipe/save_form/panelizer:node:23:page_manager that will print json data to the browser.