Pretty much exactly as it sounds.
I very recently managed to update my 1.2.2 save to 1.3.1--which realistically probably took ~10 hours of reinstalling every mod and testing to see what worked and what didn't--and was settling down to play when I realized that ever new contract the game generated for me is missing the contract agent (provider) name. It's just blank. All other data is present.
Most of my existing contracts have names. And they all have the flag graphics loaded up. Some
Alright, I think I figured it out!
I did a fresh install and only used two mods, Tantares and Bluedog Design Bureau. I noticed in game that the Tantares agency was showing up properly on the contracts menu but BDB's agencies were not, so I decided to check out the differences between the two agency CFG files. It seems that the Tantares agency CFG has one additional parameter that the Bluedog CFG did not.
In the Tantares CFG, right above "description = " is a parameter called "title