As the title suggest, I lost my Lvl 91 VK, my most powerful character with most of my best items and idols.
I played the game the day before, save and quit as normal, 3 offline chars in the character screen. Next night, I log in on Steam, see an update queued, so I update the game to 0.9k, enter the game and suddenly my VK is gone, I go to the save location in LocalLow, still 4 save files there (1CHARACTERSLOT_BETA_0-3), but the char selection screen only displayed 3.
The inventory stays the same, no item there is lost, including materials.