There is a huge thread here: [Main Thread] Specific Character login issue, kicked back to login screen - June 6th 2023 - #173 by Arumat-1210
Posting this here as well as CS has not responded in days to the many people who cannot login with a specific character after having been disconnected. It’s likely that their character’s data was somehow corrupted when you guys decided to shut down the servers and hot fix with no warning. All of the people this has happened to were in some kind of NPC dialogue (blacksmith, occultist, etc.) They can create new characters but if they try to login on that specific character they never get past the loading screen and are kicked back to character select. If nothing else, at least respond to the thread and give us an update.