Question Aorus B550 m.2 SSD Issue

[HotTowels]

I'm doing a new PC build, and I went with two m.2 SSDs. Both 1TB, one is PCIe gen4 and the other is PCIe gen 3. When the gen 4 ssd is in the gen 4 slot, and gen 3 ssd is in the gen 3 slot, the motherboard doesn't seem to recognize both. However, if I switch the two, they both show up in the BIOS.
That obviously defeats the purpose of having paid the premium for a PCIe gen 4 m.2 ssd, so I'm hoping that's not the solution.

I know that in the motherboard's manual, it says that if there's an m.2 ssd in the gen 3 slot that the neighboring PCIe gen 3 x4 slot is disabled, but that's not a problem as the only other thing plugged in is the GPU in the PCIe gen 4 x16 slot.

Any ideas as to what I'm missing here? I've searched through the BIOS but I'm not seeing anything promising. Cheers!

 

[tennis2]

Does the gen 4 ssd show up in the gen4 slot if you leave the gen 3 ssd out?

 

[HotTowels]

Does the gen 4 ssd show up in the gen4 slot if you leave the gen 3 ssd out?

Yes, it does. the gen 4 ssd shows up with or without the gen 3 ssd. Meanwhile the gen 3 ssd seems to only show up when it's in the gen 4 slot.