Attached is Drifty's workaround bugfix to allow Chapter 2 end screen saves to be used with Chapter 3.
Add it to the game folder to replace the existing scripts.rpa file.
A caveat:
With the bugfix installed and after you load a Ch 2 save DO NOT inspect any of the character/LI stats, simply click the continue arrow to start Ch 3 without doing anything else. All the relevant Chs 1 & 2 choices/variables will carry through into Ch 3.
Inspecting the character stats (shown within the blue box of the ch end screen) will result in 1. Corruption of the stats and descriptions shown, and 2. The blue box and the scene and gallery buttons (as displayed in the ch end screen) will stay as persistent overlays while you play Ch 3, obscuring the game renders.
Drifty released the bugfix as a workaround, but it doesn't completely solve the issue yet.