Fixed in 1.3.
On rare occasions when entering a populated area, the player can get stuck in place if an NPC is already occupying that location. By default other actors start in locations other than the player spawn point, but if they’ve been moving around for a while due to previous visits, their positions get saved for when the player re-enters the map. If an actor just happens to be standing on or next to the player spawn point, the player will get stuck.
This happened in Ocadia, where one of the clerics had wandered onto the player spawn point. It was impossible to move from the spot at that point, as the NPC’s sprite was overlapping. (This was also the highest difficulty setting, so using NOCLIP to escape would not work.)