Confluence 7.4.0, update page links for migration, old links still displayed/used

[Hans Pesata]

Hi!

Confluence Server 7.4.0 still display the 
We are migrating our Confluence Instance into another one.

Prior to that I am working on a script, which updates page links within pages, creating a new version using the REST API, so they work in the new instance. I used information from this article:

https://community.atlassian.com/t5/Confluence-questions/Is-there-a-way-to-update-tiny-links-when-migrating-a-confluence/qaq-p/713854

Interestingly, the updates work, I can see the new format of the links in Source Editor, but some links still seem to use the old link, when I click on it. Also the hover text is the old one.

How can this be, I don't see any error when my script executes. Can this be, that this is something that happens during the rendering of the page ? But why just for some links ?

Any hints on how to handle this, would be greatly appreciated.

Thanks in advance,
Hans