Juniper router inventory not working correctly

We have some juniper routers with linecard that has 2 PICs or more.
With devices like MX480, the discover is working ok.
But devices like MX10003 and MX304, isn't.

Usually, we saw that discovery is finding correctly the first pic (x/0), but the others are not discovered (x/1, x/2 and so on).

Because of failing the second PIC discovery onwards, the ports and modules aren't also discovered.

In the case below, second PIC was discovered (0/1/*) but all ports doesn't.

Screenshot:

We had already opened a issue about this fail (OBS-4815), but isn't working since.

Thanks.