Which processors does the MSI B550M PRO-VDH not support?

The MSI B550M PRO-VDH skips the Ryzen 5 3400G and Ryzen 3 3200G, same as other B550 boards. Those Picasso-era APUs don’t play nice with the chipset’s PCIe 4.0 routing, so MSI leaves them off the compatibility list.