I do not remember the exact words but during the caning at the assembly and one of the boys at the police station a red box popped up that said layer rendering issue. The marks still rendered behind it. I think the marks were showing but the cane was not.
Thanks for the report. As both of those sessions use the punishment cane it's probably something with the mark set. As a temporary fix you can switch to the light cane's mark set. Before the first stroke open the console (with ~ key) and type in without the quotes:
And then hit enter. That should take for the rest of the game. Close the console with the ~ key.