One of my characters recently received the luck blade magic item with 2 wishes in it. The description of the luck blade (DMG, p. 179) states:
Wish. The sword has 1d4–1 charges. While holding it, you can use an action to expend 1 charge and cast the wish spell from it. This property can't be used again until the next dawn. The sword loses this property if it has no charges.
The spell is cast from the item.
Would my character suffer the negative effects of wishing for anything besides duplicating another spell, since it states the spell is cast from the luck blade?