Ah true. Even weirder though is that there are no continuous roads between Guyana and Suriname, if Google Maps is accurate. The roads end at waterways, and I guess ferries are the way you cross borders. So there's still just the one driver side switcher on the Guyana side of the Guyana-Brazil border.

Suriname appears to have a ferry crossing with French Guiana at Albina. If it transports cars I wouldn't be surprised if muscle memory causes a lot of confusion on both sides of the river.