The health bar for the boss is there but not the boss. I've relogged and restarted the game to no avail. I've also transported to other guild members to see whether a different instance would help. Alas, no boss.
~Deedleqwerty [PS5] / NA / EU
CP 2940 NA / CP 1661 EU
Aldmeri Dominion - Wardevils
See you in Cyrodiil