Currently doing a Bloody Bear playthrough with Sonja as the LI route and noticed something going wrong :
When the optional ruin exploration mission with Yrsa was available , instead of doing it i decided that the MC would sleep the day instead, until the main story continued.
Then after the raid event to avenge Ragnar, when the boat returns to the village Sonja and the MC will go to fight the draugrs.
But during the dialogues with Sonja the MC several times will make references to himself going to the ruins with Yrsa (despite he never did), and to help Sonja against those undead the MC will even use the red crystal that is obtained in this mission (despite he never did it and so never obtained that crystal).