Passed through the wall!!
My character passed through the wall and stuck in it. The checkpoint was loaded but already saved. I couldn't play the game because I only had one save file.
Also, general gaming/gamer tip: Make manual saves approx once per hour, i.e. never rely on the auto-save only (for any videogame). Also, consider having at least two save-files, and overwrite your oldest file when saving manually, and/or make backups regularly.
Sorry to hear that.
If loading your save file or restart encounter doesn't work, restart the chapter from the main menu -> tlou -> chapters.