@ubi-borealis for me it's still not working, i have version 1.2.2 but i can't investigate the scene. its stalled at 1/3 the hidden letter was registere in the progress, but the bodies remain unable to investigate further for the story.
after reaching the springs cave, where you have to investigate the cave, it doesn't register the progress of the investigation. it also doesn't allow me anymore to investigate the bodies. i can't progress in the game now. please help to fix this problem.