Encountered this last night and it seems plenty of other players have too. I was by the POI on the river west of Arenthia by the MHK dungeon and I hard crashed and couldn't login to that one character. I think the error was CE 1008520 (I think, don't fully remember).
This is clearly an ESO specific issue however. I had to boot up the ps4 version just to move him. This has happened to lots of players, primarily on the ps5 version. Is it ever going to get looked at or is it just permanently cursed?