Exactly, it only comes with a 24mm wide, 4m long demo tape. No 12mm tape. I also found this annoying, but it is (now?) correctly described in the specification.

If it is included in the delivery, then it must be included.
It seems to me that they have received a unit that has already been returned by someone.
I don't think the factory forgot to pack the tape.
Mine came with one - I think it was a slightly shorter "demo" tape.