Related not working on new post

Hi,

Also send a ticket about this issue, but as this bug may be happening to other users as well I decided to post here as well.

Since yesterday evening the related items don’t appear anymore on new posts. This url:

https://historiek.net/maand-van-de-geschiedenis-2016-begonnen/64271/?relatedposts=1

…is returning only: {"version":"20150408","show_thumbnails":true,"items":[]}

On older posts the related do appear normally. Yesterdag evening we published another item on which no related appeared. After some hours they suddenly showed up.

https://historiek.net/parijs-in-de-achttiende-eeuw-animatie/64266/?relatedposts=1

I don’t know what’s causing this. Connection is allright according to the debug-page. Already tried installing this plugin https://i.wpne.ws/Vdoc. That didn’t solve the issue.

Regards, Yuri