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William Partner +MP Spell Book Bug

Mabinogi Rep: 23,875
Posts: 2,836
edited January 29, 2017 in Bugs and Glitches
What is the issue?
If the William Partner is equipped with a Spell Book that increases Maximum MP, such as a Ladeca Spell Book, in Equipment Slot I, and then switches to Equipment Slot II and is desummoned, every time that the William Partner is summoned after that he will lose current MP equal to the amount that the Spell Book would usually boost his Max MP by, until the Partner is switched back to Equipment Slot I or unequips any MP-boosting Spell Book from Equipment Slot I.

What steps must be taken for us to recreate the issue?
1. Give a William Partner a Spell Book that increases Maximum MP (e.g. Ladeca Spell Book) and have him equip it to Equipment Slot I.
2. Switch the William Partner's active equipment slot to Equipment Slot II.
3. Desummon, then resummon the William Partner while the Maximum MP Spell Book is in the inactive Equipment Slot I.

The partner's current MP should have decreased by an amount equal to the amount that the Spell Book in the inactive Equipment Slot I normally boosts Maximum MP.
This will happen on every subsequent resummon until the equipment slot is changed back to Equipment Slot I, or the Spell Book is unequipped.

What do you expect to happen instead?
The William Partner's current MP should not be decreased.

Visual Evidence:

IGN: Teraschione
Pet/Partner: Wiilliiam
Server: Mari