Battle of the Big Keep Enchain Bug

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Date & Time: March 11 2019
Frequency: Everytime
World name: Ultros
Character name: Shibak Tensai

Monster name: Gilgamesh
Class/Level: PLD/70
Party or solo: Solo/Unsynced

Steps:
1. Fighting Gilgamesh (Phase 2?)
2. When Gilgamesh casts Enchain
3. Auto heal is greater than the DOT he gives and essentially you are stuck until you leave the duty.
*Add more steps if necessary

Obviously can't speak for the designers, but they might not consider this a bug as that particular fight was never originally meant to be solo-cleared. In other words, the content is working as intended, but being engaged outside of intended mechanics.

It's very similar to the Siren fight in Pharos Sirus- if one of the crawling zombies gets you, you can't do anything and your auto heal prevents you from dying.