The 3D textured mesh is not georeferenced due to a technical limitation related to the precision of the data that can be exported. More specifically the real world coordinates of 3d points in a project can be very large. Due to the way the value are stored in exported files (single precision 32bit floating point) the precision is a fixed fraction of that number. Using a local coordinate system mitigates that issue (as we are dealing with much smaller numbers) and the accuracy is therefore significantly better. However it means the user needs to add an offset or be otherwise aware of that offset.
I have reported your feature request to our developers. They are thinking about adding an option that add offset automatically and warns the user about decrease of precision for future release.
The project_name_offset.xyz file should be stored in the params folder under: project_name\1_initial\params\project_name_offset.xyz. This file contains the offset of the 3D Textured Mesh (obj). This is the offset that some external software can import and place the 3D Textured Mesh in its correct position.