I also tested with model units set to both inches and meters and the output
.wrl files are identical (coordinates expressed as inch values.)
Moving to Technical Problems category as this is a bug.
from: “The Virtual Reality Modeling Language Specification”, Version 2.0, August 4, 1996 …
4.3.3 Standard Units
VRML provides no capability to define units of measure. All linear distances are assumed to be in
meters and all angles are in radians. Time units are specified in seconds. Colors are specified in the RGB (Red-Green-Blue) color space and are restricted to the 0.0 to 1.0 range.