Solved debian-live-12.0.0-amd64-kde.iso persistance fails

[saru4]

Hi all,
I have debian-live-12.0.0-amd64-kde.iso on a ventoy cd.
The linuxmint-21.1-cinnamon-64bit.iso works fine with persistance

BUT when I choose debian-live-12.0.0-amd64-kde.iso ventoy does go through the boot up correctly and allows me to choose debian-live-12.0.0-amd64-kde.iso with persistance. I can log into the desktop and install apps, but when I reboot, theres no persistance. ie it DOES NOT SAVE BETWEEN SESSIONS.

Here is my directory structure:
.
├── debian-live-11.7.0-amd64-kde.iso
├── debian-live-12.0.0-amd64-kde.iso
├── linuxmint-21.1-cinnamon-64bit.iso
└── ventoy
    ├── persistence_debian-live-11.7.0-amd64-kde.dat
    ├── persistence_debian-live-12.0.0-amd64-kde.dat
    ├── persist_LM-21.2-cinnamon.dat
    └── ventoy.json

1 directory, 7 files


*The persistence_debian-live-12.0.0-amd64-kde.dat is simply the  persistence_ext4_4GB_casper-rw.dat  file renamed.
* Here is my ventoy.json file:
{
    "persistence":
    [
        {
            "image": "/linuxmint-21.1-cinnamon-64bit.iso",
            "backend":"/ventoy/persist_LM-21.2-cinnamon.dat"
        },
        {
            "image": "/debian-live-12.0.0-amd64-kde.iso",
            "backend":"/ventoy/persistence_debian-live-12.0.0-amd64-kde.dat"
        },
        {
            "image": "/debian-live-11.7.0-amd64-kde.iso",
            "backend":"/ventoy/persistence_debian-live-11.7.0-amd64-kde.dat"
        }
    ]
}



Is there something I'm missing for debian 12 to make it persistant?
Why does Linuxmint 21.1 work perfectly with persistance and not debian 12?

Any help would be appreciated.

thanks
saru