The game crashes when trying to use either the left or right exits. It doesn't happen in the original. I attached savegames below taken in ScummVM and DOS. The console output:
WARNING: [resMan] Attempt to unlock unlocked resource message.370!
le? on non-integer (0000:00cb, 0033:1ffd) from method eastExitFeature::onMe (script 23, room 370, localCall ffffffff)!
Game Version: DOS/English/version 1.000
ScummVM Version: 1.2.0svn51754
Operating System: Win32 (XP SP2)
Fixed in rev #51821