Hello,
we noticed that since version 6.2.6 when updating a page’s custom fields the attached image disappears (as shown in the attached video).
Downgrading to 6.2.5 fixes the problem.
It seems some kind of problem related with another plugin, NextGEN Gallery https://it.wordpress.org/plugins/nextgen-gallery/ because when that one is disabled we don’t get the problem.
We are running NextGEN Gallery version 3.59 and WordPress 6.3.2
Thank you in advance