Most vehicles are missing buoyancy named property in geometry LOD
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Description

Contrary to what we did previously, this named property isn't limited to amphibious vehicles but all vehicles need this otherwise they sink into the water like there's no physx involved.
Arma3diag.exe will bitch about it with vehicles who don't have this property too, btw, so that's a clear way of knowing if a vehicle is set up correctly or not.