Windows [1.6.9] Some quests take more items than they should

[GoudaQuiche]

The wizard asked me for one void essence. When giving him the item, I use a stack of two void essences. He picks them both while he should only take one. I have seen the same thing when Robin requires some hard wood.

 

[GoudaQuiche]

To reproduce,use this savefile.

- Check the mailbox, accept wizard's request
- Pick 2 void essences from the the chest at the right of the workbench
- Deliver void essence to the wizard with a 2 items stack