Hullbreaker Isle final boss issues

Date & Time: October 8th, 2017, 4:14 pm
Frequency: Sometimes
World name: Behemoth
Character name: Samias Lemura
Monster name: Kraken's Arm
Class/Level: Level 62 Dark Knight
Party or solo: Party
In-game time: 5 PM~
Area and coordinates: Hullbreaker Isle, (4, 12)
Steps:
1. Engage Hullbreaker Isle's final boss, the Kraken
2. The first tentacle spawned is spawned in such a way that it cannot be targetted by most attacks. Weaponskills cannot hit it, nor spells. Auto attacks and some abilities do.
3. Because of the way the fight works, you will have to wait for the ability to move platforms to spawn to complete the fight, as you are unable to do much for about 20-30s.

This has happened on multiple occasions as multiple jobs and affects the entire party, in a combination of PC players and PS4 players. I have done this fight as black mage and dark knight and have had problems on both. As a caster I get the error "Target is not in range". The model of the Kraken's Arm is clipping slightly into the platform.