I can't remember which model it was, but wasn't there a MacBook Pro that had 4 USB-C ports, only two of which supported Thunderbolt? Want to connect your monitor to the right side of the machine? Well... tough shit, I guess.
As far as I’m aware, all the MacBook Pros with 4 USB C ports, both the 13 and 15/16inch from 2016 until the Apple Silicon ones arrived, were all Thunderbolt certified. I also remember in a few of the teardowns from iFixit that those devices also has one Thunderbolt controller per side.