We migrated our Confluence installation from v3.5 to v5.5. However, under v3.5 we missed to update the Numbered Headings add-on as it was not shown as an update. So we are still using v1.4 of the plugin under Confluence v5.5.
Pages using the add-on are rendered correctly so they show all numbered headings correctly. However, if you edit a page, you see that the content was not migrated and is displayed as Wiki markup (see attached file unmigrated-page.png).
I wonder if there is any way to re-migrate the pages. In a test system, I tried installing the new version and follow the Atlassian guide for handling unmigrated wiki content but unfortunately this didn't work.
Do you have any idea how this problem could be solved? I am aware that the cause for the problem is that we didn't update the add-on before the migration - but maybe there is a way to fix this. Any help would be greatly appreciated!