Bug - Bonuses from valuable items disappear

Reached Treviso and noticed bonuses from valuable items are not properly saved.

Steps to repeat (Treviso, first visit):

1. Check stats
2. Bought valuable items giving bonuses from merchants
3. Check stats: health, resistance etc. increased
4. Save game
5. Load saved game
6. Health & resistances back to original values, money used for purchases gone