Editing Field map encounter mechanics (section)

=== Mastered Preemptive Glitch ===

When equipping a Mastered Preemptive Materia, the Mastered Preemptive Flag is always set, no matter what character it is equipped on.

On any of the following conditions, the Mastered Preemptive Flag is recalculated based only on whether the third character has a Mastered Preemptive Materia equipped, ignoring any equipped on either the first or second characters:
* A battle starts (If this is a random encounter, the Mastered Preemptive Flag does affect this battle's generation before it is recalculated)
* The menu is closed and opened again
* The Materia section of the menu is exited and entered again

On any of the following conditions, the Mastered Preemptive Flag is recalculated based only on whether the ''current'' character has a Mastered Preemptive Materia equipped, ignoring any equipped on any of the other characters:
* Any Materia is equipped or unequipped
* A piece of equipment (including an accessory) is equipped or unequipped

In short, the Mastered Preemptive Flag is the least broken when Preemptive Materia are equipped on the third character, but they can still be temporarily broken.