[j-nsp] isis level-1 router not getting default route

[R Che]

I have two routers connecting back-2-back through sonet oc3.. one is L1/2 and the other is L1. for whatever reason, L1 router doesn't inject a default route. The adjacency is up and each router sees some isis route from the other.
I remember I just did it not long ago and it seemed to be fine.
Can someone help me spot anything from the config:
 
M5:
so-0/3/3 {
    clocking internal;
    encapsulation ppp;
    sonet-options {
        path-trace "Support's M5!";
        no-payload-scrambler;
    }
    ppp-options {
        chap {
            access-profile test;
            local-name m5;
        }
    }
    unit 0 {
        family inet {
            address 33.1.1.2/24;
        }
        family iso;
    }
}
lo0 {
    unit 0 {
        family inet {
            address 10.0.3.3/32;
        }
        family iso {
            address 49.0002.0003.0003.0003.00;
        }
    }
}
 
isis {
    interface ge-0/1/0.520 {
        level 1 disable;
    }
    interface so-0/3/3.0 {
        level 2 disable;
    }
    interface lo0.0 {
        passive;
    }
}

M10:
so-1/0/0 {
    enable;
    clocking external;
    encapsulation ppp;
    sonet-options {
        no-payload-scrambler;
    }
    ppp-options {
        chap {
            access-profile test;
            local-name m10;
        }
    }
    unit 0 {
        family inet {
            address 33.1.1.1/24;
        }
        family iso;
    }
}
lo0 {
    unit 0 {
        family inet {
            address 10.0.6.1/32;
        }
        family iso {
            address 49.0002.0001.0001.0001.00;
        }
    }
}
isis {
    traceoptions {
        file isis;
        flag all detail;
    }
    interface so-1/0/0.0 {
        level 2 disable;
    }
    interface lo0.0 {
        passive;
    }
}
user at m10# run show isis adjacency
Interface             System         L State        Hold (secs) SNPA
so-1/0/0.0            support-jm5-1  1 Up                   22
user at m10# run show route protocol isis
inet.0: 24 destinations, 24 routes (24 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both
10.0.3.3/32        *[IS-IS/15] 00:05:38, metric 10
                    > to 33.1.1.2 via so-1/0/0.0
 

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