Database – WP 6.0. Data corruption while updating

I am seeing some kind of data loss while updating to WP 6.0.

Connections between posts and categories are lost after the update. In particular, the two categories “disappear”.

The first screenshot shows the four listed categories but the count shows the actual number of six.

All six categories appear on the New Posts page, but if you select one of the missing two, nothing is saved.

Image 10-12-2022 at 1.15 PM

The posts themselves are still there but the classification has been lost.

Image 10-12-2022 at 1.22 PM

Any idea where to start?

Thank you.

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