New SSD stuck at 3.0 x2 PCIe on my PC, but runs at x4 in another, and another SSD runs at x4 on mine, wth?

[Vasllo]

So, I bought a Hiksemi FUTURE 1TB SSD to use alongside my XPG S70B 2TB and replace my SN550 500GB, but it's running only at PCIe 3.0 x2, while the SN550 runs at 3.0 x4 in the same slot, and the Hiksemi runs at 3.0 x4 in another PC. My motherboard is a B460M, which limits them to PCI-e 3.0, but it's alright for now and not the issue. I also tested in a H610 with an i3 13100F, which ran it at 3.0 x4. My B460M has the latest UEFI. Both S70B and SN550 are NVMe 1.4, while the Hiksemi is NVMe 2.0, that's the only difference I spotted.

 

I have no idea why this is happening, I don't see anything I could do in UEFI to change this, it works as expected in another PC, my motherboard works as expected with another SSD, but they won't go together. Any ideas?