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The migration is almost done, at least the rest should happen in the background. There are still a few technical difference between the old cluster and the new ones, and they are summarized in this issue. Please pay attention to the TL:DR at the end of the comment.
It was looking at the "outer" peer of the ghost pad, not the "inner" peer (the target).
It provided the wrong pad to gst_element_release_request_pad.