Interesting, I don't have a problem with an older RX 5700, but I have an Intel CPU.
Check the Bios/UEFI for specific settings for Pci-Ex (i.e. the video card slot), if set to Auto, 4x, 5x etc...
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Being that everything else I've tested works great I don't think anything would be wrong there. Definitely will check when I'm home though, never know. Cheers.