AMD rz608/ mt7921k does support WPA3 just fine, I owned one of those myself. Finding the right driver, which supports 6 GHz, is a tad more difficult, you may have to try your way through https://www.catalog.update.microsoft.com/Search.aspx?q=rz608 and https://www.catalog.update.microsoft.com/Search.aspx?q=mt7921.
It probably supports WPA3, but it very well may not support mixed-mode.