Unit computed a path that makes it stuck, then ignores some but not all move orders

[elexis]

In this replay with r22426 a female (entityID 7084, F9 -> g_Selection.addList[7084];) was gathering, got stuck near a small stone mine and stopped moving. The woman received some move orders and changed the direction she was facing, but did not move. Some move orders later she did move.

[wraitii]

Cannot reproduce the behaviour on the replay post D1907 - this appears to trigger a safety fallback case in PathResult but it works nowadays and the woman gets to build the first and second house, then follows other units.

[wraitii]

Fixed by ​Phab:D1907