Is a multi-sector connection included in the floor slab?

Hello everyone!
Until yesterday, I was not familiar with this word (MSA - Mehrspartenanschluss).
Now our main contractor is asking us who is carrying out the MSA for us.
The main contractor is responsible for the base slab (we are building without a basement) and the entire house. Only the earthworks and connections on the property are not included.

Our contract states:
"All lines are routed together and end at the outer edge of the base slab. Up to 4 penetrations of the outer wall/base slab for drainage pipes are included. ... You will receive planning security for your finances."

The main contractor had informed us several times about what is not included in the offer. This MSA appears for the first time.
Isn't it customary for the MSA to be installed together with the base slab?
How has it been with you?

Usually, the MSA is to be provided by the client and installed by the contractor

The main contractor would probably just lay empty pipes (KG pipe) for wastewater inside. MSA costs, just like other utilities (gas, electricity, water, fiber optic, cable), are not included. It should actually have been noticed during an inspection by a professional.

Thank you. Now my trust is slightly shaken because we often asked the GU what additional costs would arise – this was definitely not included. However, our construction consultant (who independently reviewed all contracts) did not notice it either.

Our contract states: "All pipes are combined and end at the outer edge of the floor slab.

In which paragraph of the contract is this stated? About connections in general or only about water/sewage?

899,- euros extra for the MSA with us.