random/carpathian:some areas impassable when size set to Medium or smaller

[andy5995]

On the forum, Old Roman reported

(in A26)

I tried Carpathian 3 times at medium map size (4 vs 4) and each time it put me in a valley on a flank with no path out. The first time I built a fortress up against a cliff and I was able to free 1 soldier up top at a time by emptying a full house in that direction (So that bug is still kind of there).

They were able to build a camp but by that time my allies were all too far gone. I found it odd that I was the only civ that was locked in in all of my three attempts

I changed to a normal sized map and the problem went away.

[andy5995]

Old Roman added it's not always a problem on Medium maps and provided a replay (a26 if I'm not mistaken) of a game when it was a problem (attached here now)
carpathian_replay_medium_impassable.zip

[andy5995]

Norjay, the map author, updated the map and I've replaced it with his newer version in f1a1156