While I don't know offhand what the TA-1.0 version is, maybe if you can identify where the tracking is coming from you can get some more info... is it maybe coming from a very old code implementation? Maybe a no-script implementation (which might explain the lack of hit depth counter) like for a Newletter tracking, or as a compensation for users who have disabled JS? Maybe it's an AMP implementation?

There's several possibilities, I think the first step is to try and find the page that is sending this tracking call, then to investigate how the code has been implemented.

Good luck.