Hi there,
Yes, I am using the Corona bitmap as to my knowledge C4D does not natively support UDIM textures, at least not when we made the model 2 years ago.
*HOWEVER* when preparing the file for you I seemed to have stumbled on the possible cause, let me verify this first:
When we render scenes on the renderfarm, we do a "save project with assets", then zip the result and upload it to the renderfarm. It seems that when you "save project with assets", C4D casually ignores that you have a UDIM ranged texture in the project and only includes the texture channels 1001 UDIM.
I'm going to manually include the rest of the textures now and see if that fixes the issue, but in the meantime it might be good for the people on your end to see if they can ensure that full UDIM range textures are included when doing a "save project with assets", not just UDIM 1001 textures.