Systemctl set-default graphical.target failed on Fedora IoT 39

Hi.

After installing a fresh Fedora IoT version 39 on a Raspberry Pi 3, I found a strange problem: apparently every change done with systemctl to standard packages services is not commited, so not available after the next reboot (example: systemctl disable ModemManager).

Also “systemctl set-default graphical.target” link is not kept (of course I installed xfce before).

But new services created “by hand” were kept…

As far I can say, under Fedora IoT 38 the change was kept.

A regression or my fault?

Thanks for any help.
GT