I use those exact boots. Gonna take a close look at them right now lol
Edit: I removed bottom half of the clasp (it is attached with screws) and there were no signs of cracking where it failed on OP's pair. Mine show more wear on the leather bits than the clasp frankly.
I'm not defending "Joe Rocket"**, in fact I would say I have seen questionable gear from them in the past. Just that since mine have more than a few years on them, that the failure shown above is strange, especially if barely left the shop.
**Who is Joe Rocket these days, exactly? There is more than one company that uses that brand, and possibly has changed hands over the years. Which Joe Rocket made those boots, and is there any company around today that would actually be responsible for them? Frankly since those are from a Honda dealer and they have Honda plastered all over them, I would see about persuading them to deal with it