This is widely known in the community but I figured I’d still create a bug report about it.
Melee military units can hit other units through palisade walls. This commonly happens when you have melee units attacking the wall and villagers on the other side repairing it. By a moving with the military units, you can get some of them to attack the repairing villagers through the wall.
This could be intentional game design, but it feels more like a bug. It doesn’t make sense that melee units can attack through a wall. I also prefer the game design where they cannot. It makes it effectively impossible to repair the wall against a good player because they will always hit your repairing villagers through it.
If it is hard to program the wall to actually block melee attacks, then maybe the villager repair distance could be improved so that villagers don’t have to get quite as close to the wall to repair as they do now.