When triggering a raid in a village that is in a taiga or anywhere that has mild hills, the Ravenger just can't pathfind its way down the hill.  It walks back and forth a few times then eventually just stops.  Very annoying when you are in a village raid with 1 raider remaining, and i have to go on a goose hunt for 20 minutes to find where he is stuck.  Tested on multiple worlds with the same result.