Which slots / connections (i.e. PCIe, NVMe, SATA) are mutually exclusive for MSI B450 Gaming Pro Carbon?

I have a MSI B450 Gaming Pro Carbon.

It offers

  • 2 NVMe slots
  • 5 PCIe slots

I have two NVMe drives installed. I have one GPU on PCI_E1.

I wanted to upgrade to a 2.5 GBit ethernet card and I thought I could slot one in on one of the other free PCI_E slots.

Yet while the ethernet card works fine after booting, I don’t see my second NVMe SSD drive after booting, so it seems the feature is either-or: I can either install a NVMee drive or I can add a extension card into a PCI_E slot.

I tried all the slots except PCI_E2 directly below the GPU slot as I cannot install the ethernet card due to spacing issue.

Before I buy a raiser extension: Would that slot even allow for both using the NVMe hard drive together with the PCIe ethernet card, or would again my NVMe stop working?

Or more general: Which slots on this board are mutually exclusive?