/ mount source should be overlay not none

Run findmnt in CS10 bootc system, then find the SOURCE of / is none. That should be overlay as SOURCE

TARGET                                 SOURCE                                                                                                                          FSTYPE     OPTIONS
    /                                      none                                                                                                                            overlay    ro,relatime,seclabel,lowerdir+=/run/ostree/.private/cfsroot-lower,datadir+=/sysroot/ostree/repo/objects,redirect_dir=on,metacopy=on