ID 538498 - UDIMs do not bake correctly when using Python 3

Problem summary
UDIMs do not bake correctly when using Python 3.
 
Customer reported version
Modo 16.1v1
 
Customer reported platform
macOS 12 Monterey
 
Steps to reproduce
1) Download attached file and open it in Modo.
2) Navigate to the Shader Viewport, and then expand the Bake Items layer.
3) Select Output Baking Diffuse Color Output, then under its Properties choose an Output Directory to save the files.
4) Select the mesh in the 3D Viewport, then under the Properties tab select Render Output Bake Item.
5) Press the Bake Selected Button and observe the results.
 
Expected behavior
The UDIMs should bake with the same scale for each of the textures.
 
Actual behavior
With each successive UDIM, the textures shrink in size.
 
Workaround
Navigate to System > Python Version and change the version to Python 2.
 
Reproduced by Support in:
16.1v2 - Windows 11, macOS 12.6 Monterey 
15.0v1 - Windows 11, macOS 12.6 Monterey 
 
Earliest version tested
15.0v1 - This feature did not exist before this version.