Holes in the newly laid parquet

It's clear that the floor wears out, but this is simply not a normal dent. Above all, it is located in a hardly used area right in front of the sliding door, which we didn't even use without a finished terrace.

Depending on how it is sealed or treated, I have achieved useful results with very fine steel wool as an abrasive. Back then, the fibers of the wooden floorboards had raised and the floor looked like an unplaned surface. Very gently "brushed over" with steel wool and we even had a velvety shine effect.
Of course, you have to be very careful, but it sometimes works better than sandpaper.
It is still a "defect"....... I remember similar ones we had back then. The only comforting thing about it is that you eventually lose sight of it.
But as I said, it depends on how your floor is treated.

Hello "Tassimat" (how does one come up with such a term??).
Well, whatever the reason for the dents, here is a practical tip to significantly reduce the dents in the wear layer:
Take a new, folded TEMPO tissue tonight and cut out a piece about 2 x 2 cm with scissors. We also need a shot glass.
Dampen the piece of tissue well with water, but please not so much that it is completely soaked and water runs out! Less is more here!
Place this moistened cellulose on the dent and cover the whole thing with the shot glass, which, turned upside down (with the open side facing the parquet), protects the tissue from drafts.
After maybe 12 hours, you will see that the dents have mostly been pushed out again by the swelling pressure of the wood. This works in most cases and only if the wood cells have not been so compressed by significant point loads that the elasticity of the wood has given way to plasticity.
Just give it a try!
Regards: KlaRa

The trick with water only works on "compressed" wood, meaning when there is a dent where it was previously smooth. The water causes the wood to return (a little) to its original shape.

In the photo, in my estimation, it looks more like "splintered from planing." (actually, that should have been sanded off ... but apparently was not)

I would also recommend sanding (if the floor is not varnished, ... which does not seem to be the case). Then repeat the same treatment that the floor received. This can also leave visible "spots."

I also think the other advice is good:
Relax. More dents will appear and that is normal - especially with wood.

Lately, I have been thinking more often (since I own a house myself) about what people like:
New materials look good at first and then develop their "patina" (or flaws).
Old houses (for example half-timbered) often have a charm that many people recognize.
However, most people do not want to experience the transition.

The process from new to old is not popular.
That is understandable, but I believe being more relaxed about it or becoming so can be helpful for one’s own well-being.

Yes, I think it's a planer error. It's just annoying that the spot is totally rough and you end up ruining your socks. I will sand and oil it for you in the next few days. Thanks again for the tips and assessments.