Project 1999 - Crystal Spiders in Skyshrine

There's this quest: https://wiki.project1999.com/Spider_Legs_Quest

Quote:

Sentry Kale says, 'Very well, it is a minor task, but I am sure that you are quite capable. Lately the food supply in the guards' galley has been dwindling. I fear that there are spiders amongst us who are pilfering our food when we do not see. I would ask of you to please seek out and eliminate these vermin for us. Bring their legs back to me and I shall reward you for your effort.'

The thing is... the guards will attack you if they see you killing the spiders that have infected their food supply. This should not be happening. The spiders should social agro with each other but not with the guards.