So, are there daily saves? Maybe someone passed through that area earlier and triggered something? If it's a terrain glitch, I suggest discussing it in the rules thread.
Shifted terrain. In case of discovering an unguarded passage between zones, and the absence of a visible guarded passage, allow free passage to that zone.
Let's not be bureaucrats; let's just play. It's unlikely that an impassable group of golems decided the outcome of this game. And sending the save file to the moderators every time there are such controversial questions is not a solution. Moreover, the screenshot clearly shows: 2 paths (let's call them roads) and 1 guard, which is not normal if the roads do not intersect.