planet.qt.io missing blog entries

Quite often planet.qt.io skips blog posts from the feeds it aggregates.

E.g. right now it's skipping over this blogpost https://www.kdab.com/how-to-cast-a-function-pointer-to-a-void/ (dated 31 jan). planet.qt.io right now saved on archive.is : https://archive.fo/smfKU

Note how it instead shows an earlier blogpost from the same feed (by Sérgio).

From time to time it also happens to the qt.io blogposts, the vplay ones, and so on. It's noticeable because other aggregators pick those posts up, but not planet.qt.io.