https://wccftech.com/asus-proart-b550-creator-motherboard-thunderbolt-4-support-unveiled/

ASUS's ProArt B550 Creator motherboard is going to be the first product, not only based around the AMD platform, but the first in general to feature support for Thunderbolt 4. The motherboard also carries a very unique aesthetic which is designed around the content creator segment.

Didn't the Z590 motherboards already have Thunderbolt 4? The answer to that question is yes. Yes, Z590 motherboards already feature Thunder 4 connectors, but the ASUS ProArt B550 Creator is a B550 chipset. The B550 is the mid-range chipset for AMD's AM4 socket.