Weird textures on lv 79 first boss attack

[Arrowned]

Date & Time: 2020/12/17 10:21pm EST
Frequency: Only seen it once, but I've only run the dungeon once today. That said, all four members of my party reported seeing the same error, so this isn't individual to just me.
World name: Faerie
Character name: Hetero Upsetero
Monster name: Forgiven Cruelty
Class/Level: 80
Party or solo: Party
Area and coordinates: Mt. Gulg dungeon

Steps:
1. Get to the boss and wait for it to use Typhoon Wing attack. The visual effects of the conal aoes are messed up when the boss is casting.