RequestRaidInfo() is cached for a while (unknown/random time) once a boss has been killed.

Temp. solution would be to track the encounterId and difficultyId with the ENCOUNTER_END event and mark the boss as killed for the week.

Reminder: Check to see if there's a Saved Instance ID/Object and if not, create a temp one. Also renew the weekly expires/reset time in case of an old object.