Interesting item description by this seller.
“My Matsushita blu-ray burner doesn’t recognise the BD-R format”
That makes no sense to begin with. Maybe he meant BD DL?
As Zevia said, this looks like a failed burn. I wonder which optical drive this failed on. A likely candidate is one from a notebook.
Maybe the power went out during the burn (bad luck)?
Or maybe he accidentally hit the cancel button? What actually happens when you hit cancel, btw, for non-rewritable discs? On a standalone DVD recorder, you can erase the partial program but you don’t get the space back. Would it be similar for PC burns? I’ve had some failed burns, mostly from lower quality media, so I’ve simply chucked them into the wastebasket. I’ve never actually canceled a job on purpose.
Anyways, I hope you get a refund or something along those lines.