ID 509479 - Saving specific FBX files results in insanely large file size.

Problem summary
Saving specific FBX files results in insanely large file size.
 
Customer reported version
modo.16.0v1
 
Customer reported platform
windows10
 
Steps to reproduce
 
1) Download the attached files and open the include .fbx file inside of Modo (1.7~GB).
2) Once the file is loaded select File > Save As... and set it to save out as a .lxo
3) Leave the scene to save and notice that an unreasonably large file is outputted (340~GB), or if there isn't enough hard drive space it will fill up and the saving will cancel due to lack of space.
 
Expected behaviour
The file should be saved as a .lxo without such as massive increase in file size.
 
Actual behaviour
The outputted file size is unreasonably large.
 
Workaround
Unknown.
 
Reproduced by support
 
This bug has been reproduced in:
16.0v1 - Windows 11, macOS 10.16
13.0v1 - Windows 11, macOS 10.16
 
Earliest version tested
13.0v1 - This issue appears to be in all versions of the product.