ᐅ Shell construction: Are broken corners and gaps properly filled with masonry?

Hello everyone,

we are currently having a house built.
I have noticed a few things that I am not sure are correct.

In some places, the corners of the Poroton blocks are chipped, and in other areas, leftover stone pieces (thin stone slices) have been set in with plenty of mortar. From my perspective, these areas would have fit half a block instead of four thin leftover slices bonded together with mortar.
A friend who is a mason looked at it and just said, “It’s just using up leftovers. No one will see it anyway. It will be covered with plaster.” He didn’t say much more and didn’t see anything wrong with it.
As a layperson, I would have cut a half block instead of using small pieces.
It seems odd to me as a non-professional.
The Poroton blocks rely on the air inside the block, especially regarding sound insulation and thermal insulation.
Can you tell me something about this?

Best regards
Varone