Healer LB3 fired and consumed charges but did not work

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Date & Time: ~13:30 GMT-5 2021/02/21
Frequency: One-time
World name: Exodus-Primal (cross-realm raid)
Character name: Mikh'to Mewriliah@Exodus
(bug didn't affect me directly, spell was cast by someone else named Faline Light@Behemoth)
Monster name: Diabolos
Class/Level: Synced 60
Party or solo: Raid
Area and coordinates: Raid Dun Scaith
Steps:
1. Our healer was rez'd to cast LB3.
2. Healer cast LB3, died just as the cast finished
3. Charges were consumed but our party was not raised