How to do the foundation slab for a semi-detached house

Unfortunately, I do not have the complete planning at hand yet. So definitely remove the bubble wrap. Is the soundproofing mat even necessary? Can the joint not remain open? I just had a conversation with our expert. He said to remove the bubble wrap and then put in the perimeter. The perimeter is only supposed to prevent anything from falling in during masonry work and thus prevent contact between the floor slabs. My expert then said that before the masonry, the fiberglass wool will be placed against the neighboring wall before our masonry work, so nothing can fall in. Is that sufficient then?

If you have an expert, then you can already trust him. He is on site and knows the conditions.

Well, that's a package from the TÜV included in the house price. He was not on site because of the foundation slab. I only explained that to him over the phone.

Well, at least my site manager is now getting in touch with him. Let's see what they decide.

Oops, yesterday evening you already raised the walls to 1m high and now the wall to the neighbor is gone again. Now a slot 3cm wide is created and filled with Perimeter. According to the architect and the TüV, it should be like this, so it should fit, right?