The compilation error with the moc happens with the line:
WXG_PROPERTY ( 3DArea, "Surface area", "", eFmtUnspecified)

The compiler (MSCV, clang or GCC) is able to compile/preprocess the file correctly but not the moc.

Here is the error returned :
:/Sources/sample_projects/moc_issues/moc_error/wxg_property_native_propids.(2:1): error: Parse error at "eProp3"

This seems related to the fact that the identifier concatenated inside the macro starts with a number. If the above line is removed, everything works correctly.

To reproduce, please run the attached example project.