Wikidata item https://www.wikidata.org/wiki/Q105338 was vandalized at 22 March 2019 by an IP-user who among other things changed the image (P18) to the image of another person. The vandalism was backrolled 2 April 2019.

10 days later, at 12 April 2019, some users at dawiki see the image from the vandalism in the infobox at https://da.wikipedia.org/wiki/Geert_Wilders which fetches the image from Wikidata. One logged in user, and one not logged in user reported seeing the wrong image. I saw the correct image when logged in, but the wrong image when not logged in.

A null edit seemed to fix the problem, but I think the rollback at 2 April should have propagated to Wikipedias after 10 days.