Leftovers in referenceIndex after RteFileLinksUpdateWizard
Assume you have more than one link to the same file in the same RTE field.
You have equal count of referenceIndex entries then.
On migration ALL links in the field are changed on processing first referenceIndex entry, but only the one referenceIndex entry is updated after.
The others will stay "invalid" and the wizard step will not be finished and shows errors on next run.