Any unit can walk into "impassible" rock formations, they are kind of lost after that. See the attached example map.
Example map with rock features that units can enter
This is not really a bug. You have to surround the big rock with invisible blocker units ( in the map editor ).
I'm changing this to WONTFIX/closed since it's not offtopic (no reason to delete IMO).
Sign up for the SourceForge newsletter:
You seem to have CSS turned off.
Please don't fill out this field.