The first event coming from no_pnord is sometimes malformed, and shows up as ". This has happened to several, but not all, shipments this year, including 70727320210264560 and 00370730252008397622, with slightly different results (the former has only one malformed message, the latter has two). This seems to happen only when it's just the one or a few events, and gets fixed if the shipment is added after a few events have occured.
For instance,
this is a shipment that was added early (note event #3, Track Added). Compare this to
the same shipment added today, where the issue does not occur. The shipment 70727320210264560 shows this issue today, even if I do add it multiple times. However, I fear it will fix itself soon, and I can't promise when I will have a new example.